Top Performance Testing Services in the United Kingdom
From London’s fintech corridor to Manchester’s e-commerce powerhouses and Cambridge’s research-led startups, the UK is a prime market for high-stakes digital performance. Performance testing services help teams validate speed, scalability, and resilience before peak events and product launches.
On Clutch, you’ll find verified UK partners specializing in load, stress, and website performance testing, backed by in-depth client reviews, case studies, and service focus data. Use filters for budget, tech stack, industry, and location to shortlist the right fit—whether you need an onshore consultancy for regulated environments or a hybrid model for faster throughput. Start with these curated directories:
• Top Performance Testing Companies
• Performance Testing Companies in London
• Performance Testing Companies in Birmingham
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$5,000+$25 - $49 / hr10 - 49London, England
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See all 31 projectsTHEY.dev is a versatile web development firm specializing in creating and enhancing digital platforms, as evidenced by their projects with various industries including SaaS, e-commerce, and nonprofit organizations. A consistent theme across 90% of the reviews is their strong value for cost and the alignment of company values. Although communication was sometimes noted as needing improvement, 100% of clients expressed satisfaction with the project outcomes and praised the team's expertise and adaptability.
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$10,000+$50 - $99 / hr50 - 249London, England
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See all 20 projectsValor Software is a versatile software development company specializing in creating cloud-native platforms, integrating complex systems, and enhancing user experiences across various industries. The company is highly praised for its project management and technical expertise, with 100% of reviews highlighting their professionalism, timely delivery, and effective communication. Valor Software consistently exceeds client expectations by offering tailored solutions that combine creativity with precision, earning a strong reputation as a reliable tech partner.
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$10,000+$25 - $49 / hr50 - 249London, England
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See all 25 projectsTestFort QA Lab is a specialized Software Quality Assurance company known for its comprehensive App and Software Testing services. Across reviews, 100% of clients commend its ability to enhance test coverage and reliability, highlighting a consistent improvement in platform stability and issue reduction, such as a 40% average decrease in post-release defects. Their adaptable QA processes and integration into client workflows have been particularly lauded.
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$1,000+$100 - $149 / hr50 - 249Rochdale, England
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See all 78 projectsPlutoSec is a cybersecurity company specializing in comprehensive penetration testing and application testing services. Reviews consistently highlight their manual-first approach to security testing, which goes beyond automated scans, and their ability to deliver clear, actionable remediation guidance. With over 85% of reviews noting their strong project management and communication skills, PlutoSec is regarded for its commitment to enhancing clients' security postures and aligning with industry standards.
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$1,000+< $25 / hr1,000 - 9,999London, England
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See all 4 projectsQualimatrix Technologies Pvt Ltd is a company specializing in comprehensive software testing services, including App Testing, QA Testing, and Software Validation. With a strong emphasis on quality assurance, they have received overwhelmingly positive feedback, with reviewers highlighting their expertise, effective communication, and commitment to deadlines. Approximately 90% of reviewers appreciated their tailored testing approaches and proactive problem-solving skills.
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Undisclosed< $25 / hr10 - 49London, England
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See all 6 projectsBlue Ripples Technologies is an application testing and software testing company that excels in providing automation solutions and integration services. The company has received overwhelmingly positive feedback, with clients praising their industry expertise and project management skills. They are noted for their ability to act as a partner, aligning with client visions and demonstrating flexibility throughout project phases.
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$5,000+$25 - $49 / hr2 - 9Keynsham, England
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See all 1 projectsTestology.io Ltd is a quality assurance company specializing in developing robust QA solutions. According to positive feedback, 100% of reviewers commend their ability to meet or exceed timelines and deeply understand complex product missions. Clients highlight their invaluable work and successful implementation of comprehensive QA processes.
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$75,000+$50 - $99 / hr250 - 999London, England
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See all 5 projectsTestinium is a leading provider of application testing and software quality assurance services, recognized for their expertise in testing automation and quality improvement. Reviews highlight their impressive testing automation suite and quick response times, with 100% of reviewers appreciating their technical competency and project management skills. Clients report significant improvements, including a 6% decrease in technical bugs, reflecting Testinium's effective and reliable services.
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$5,000+< $25 / hr10 - 49Woking, England
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See all 1 projectsTesting Frameworks Limited specializes in Application Quality Assurance, providing exceptional Software Testing services. They consistently deliver detailed reports on time, aiding faster development cycles. Review feedback is overwhelmingly positive, with 100% of reviewers praising their understanding of project complexity and their impressive teamwork. Their services are commended for aligning well with client needs and budgets.
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UndisclosedUndisclosed1,000 - 9,999London, England
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Launched in 1997, Qualitest Group is a large Santa Clara, California-based Application Testing company. Their team offers Application Testing.
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UndisclosedUndisclosed1,000 - 9,999Reading, England
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Planit Testing is an Application Testing company. They were established in 1997, and their services include Application Testing and IT strategy consulting.
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$5,000+< $25 / hr10 - 49London, England
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Launched in 2013, TAREENITY FZE LLC is an Application Testing company. Their team provides Application Testing and Application Management & Support.
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$10,000+$25 - $49 / hr50 - 249London, England
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Established in 2016, ClicQA is a midsize Application Testing company. Their services include Application Testing.
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UndisclosedUndisclosed10 - 49London, England
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360logica Software Testing Services is a Noida, India-based Application Testing company. The team provides Application Testing and Custom Software Development.
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UndisclosedUndisclosed50 - 249LE5 4LE, England
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Infuse Consulting is a midsize Application Testing company. They focus on Application Testing and DevOps Managed Services and were founded in 2002.
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UndisclosedUndisclosed50 - 249London, England
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Inspired Testing is a London, England-based Application Testing company. They specialize in Application Testing and IT managed services and were established in 2018.
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UndisclosedUndisclosed1,000 - 9,999London, England
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Tricentis is an Application Testing company headquartered in Austin, Texas and Wien, Austria. They specialize in Application Testing and cloud consulting & SI and were founded in 2007.
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UndisclosedUndisclosed1,000 - 9,999Crawley, England
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Spirent Communications is a Cybersecurity company in San Jose, California and Beijing, China. They offer Cybersecurity and IT managed services and were launched in 1936.
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UndisclosedUndisclosed50 - 249Basildon, England
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Testing Minds is an Application Testing company launched in 2018. The company provides Application Testing.
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UndisclosedUndisclosed250 - 999Birmingham, England
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Resillion, an Application Testing company, was launched in 2022. The midsize team focuses on Application Testing and Computer Engineering.
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UndisclosedUndisclosed250 - 999London, England
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Ten10 Group is a midsize Application Testing company. Founded in 2004, the team provides Application Testing and Artificial Intelligence.
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$5,000+Undisclosed2 - 9London, England
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Mtest Labs is an Application Testing company. They were launched in 2011, and their services include Application Testing.
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UndisclosedUndisclosed250 - 999London, England
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Located in North Sydney, Australia and London, England, iLAB is an Application Testing company. They offer Application Testing.
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UndisclosedUndisclosed250 - 999London, England
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Sollers Consulting, a big data analytics company, offer BI & big data consulting & SI and cloud consulting & SI. They were founded in 2000.
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$5,000+$100 - $149 / hr10 - 49BOLTON, England
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NovaQA LTD is a small Application Testing company headquartered in BOLTON, England. Their services include Application Testing.
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UndisclosedUndisclosed50 - 249Nether Poppleton, England
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Established in 2002, Acutest (Part of Trustmarque) is a midsize Nether Poppleton, England-based Application Testing company. Their team specializes in Application Testing and UX/UI Design.
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UndisclosedUndisclosed50 - 249Edinburgh, Scotland
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2i Testing is a midsize Edinburgh, Scotland-based Application Testing company. Their services include Application Testing.
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$25,000+$25 - $49 / hr10 - 49London, England
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APPNETWISE is a Hyderabad, India-based IT strategy consulting company. They specialize in IT strategy consulting and cloud consulting & SI and were launched in 2022.
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$10,000+$50 - $99 / hr2 - 9London, England
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IQspeaks L is an Application Testing company. Launched in 2015, the company is based in London, England. Their team specializes in Application Testing.
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$5,000+$25 - $49 / hr2 - 9London, England
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RedQA is an Application Testing company. Based in London, England and New York, New York, the agency was founded in 2023. Their team specializes in Application Testing and Computer Engineering.
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UndisclosedUndisclosed2 - 9Accrington, England, England
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Fortitude 17 Limited is a small Application Testing company. Founded in 2017, the team focuses on Application Testing and ERP consulting and SI.
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UndisclosedUndisclosed2 - 9City of London, England
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ClicTest is an Application Testing company. Their small team is headquartered in City of London, England and offers Application Testing. The firm was established in 2013.
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UndisclosedUndisclosed50 - 249Telford, Shropshire, England
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NFocus Testing, an Application Testing company, was established in 2000. The agency offers Application Testing and IT strategy consulting, and is midsize.
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UndisclosedUndisclosed50 - 249London, England
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Launched in 2009, BEE Incorporations is a midsize Application Testing company based in Milano, Italy and London, England. Their team offers Application Testing.
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$1,000+$200 - $300 / hr10 - 49Burnham, England
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Creative Computing Solutions is an ERP consulting and SI company. They were established in 1990, and their services include ERP consulting and SI and Application Management & Support.
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UndisclosedUndisclosed10 - 49London, England
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Launched in 2016, Assured Thought, a small Application Testing company, is headquartered in London, England. Their team focuses on Application Testing and IT strategy consulting.
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UndisclosedUndisclosed250 - 999London, England
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Insead Tech is a midsize e-commerce development company based in London, England. The team focuses on E-Commerce Development and ERP consulting and SI.
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UndisclosedUndisclosed1,000 - 9,999London, England
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Genisys Group is an user experience company. Based in London, England and Bengaluru, India, the company offers UX/UI Design and IT strategy consulting.
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UndisclosedUndisclosed10 - 49Bristol, England
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Moropo QA, an Application Testing company, was founded in 2022. The team provides Application Testing.
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UndisclosedUndisclosed10 - 49London, England
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FGB studio, an Application Testing company, is based in Milan, Italy and London, England. Their services include Application Testing.
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UndisclosedUndisclosed10 - 49London, England
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Based in London, England, Cinq Amis is an Application Testing company. Their services include Application Testing and IT managed services.
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$10,000+$50 - $99 / hr10 - 49Sheffield, England
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DeeperThanBlue is a cloud consulting & SI company. They are located in Sheffield, England, and their services include cloud consulting & SI and E-Commerce Development.
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$50,000+$25 - $49 / hr10 - 49London, England
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Momin Solutions is a business intelligence company founded in 2010. The agency focuses on BI & big data consulting & SI and cloud consulting & SI, and is small.
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UndisclosedUndisclosed2 - 9Glasgow, Scotland
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Scapa Technologies is an Application Testing company. The team is based in Dun Laoghaire, Ireland and Glasgow, Scotland, and their services include Application Testing and IT strategy consulting.
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UndisclosedUndisclosed2 - 9Nelson, England
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Blue Border Limited, an IT managed services company, is headquartered in Nelson, England and London, England. Launched in 2015, the team provides IT managed services and Application Testing.
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UndisclosedUndisclosed10 - 49Liverpool, England
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Aspion is a Staffing company. They were launched in 2004, and their services include Staffing and Application Testing.
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UndisclosedUndisclosed10 - 49Coventry, England
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SMQA Limited is a small ERP consulting and SI company based in Coventry, England. The team provides ERP consulting and SI and Cybersecurity.
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UndisclosedUndisclosedFreelancerLondon, England, England
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TR Seeds Ltd is an Application Testing company. Established in 2019, their team focuses on Application Testing.
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UndisclosedUndisclosed10 - 49Hertfordshire, England, England
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IOCO UK | iOCO Solutions Limited is a big data company founded in 2008. Located in Hertfordshire, England, England, the team offers BI & big data consulting & SI and cloud consulting & SI.
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UndisclosedUndisclosed2 - 9London, England
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Located in London, England, TestPro Consulting Ltd is a small Cybersecurity company. Their services include Cybersecurity and Artificial Intelligence.
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List of the Top 9 United Kingdom Performance Testing Companies
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$10,000+$25 - $49 / hr50 - 249London, England
Ability to deliver
33.8/40.018.6/20 Reviews8.7/10 Clients & Experience6.5/10 Market PresenceService focus
100% Application Testing20% Performance Testing -
$10,000+$50 - $99 / hr50 - 249London, England
Ability to deliver
38.4/40.018.6/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
10% Application Testing10% Performance Testing90% Other -
$5,000+$25 - $49 / hr10 - 49London, England
Ability to deliver
34.8/40.018.2/20 Reviews10/10 Clients & Experience6.6/10 Market PresenceService focus
10% Application Testing10% Performance Testing90% Other -
$1,000+$100 - $149 / hr50 - 249Rochdale, England
Ability to deliver
30.2/40.020/20 Reviews4.4/10 Clients & Experience5.8/10 Market PresenceService focus
20% Application Testing10% Performance Testing80% Other -
$1,000+< $25 / hr1,000 - 9,999London, England
Ability to deliver
21.3/40.016.4/20 Reviews0/10 Clients & Experience4.9/10 Market PresenceService focus
50% Application Testing20% Performance Testing50% Other -
Undisclosed< $25 / hr10 - 49London, England
Ability to deliver
31/40.015.8/20 Reviews10/10 Clients & Experience5.2/10 Market PresenceService focus
10% Application Testing10% Performance Testing90% Other -
$5,000+$25 - $49 / hr2 - 9Keynsham, England
Ability to deliver
24.2/40.016.2/20 Reviews2.4/10 Clients & Experience5.6/10 Market PresenceService focus
100% Application Testing25% Performance Testing -
$75,000+$50 - $99 / hr250 - 999London, England
Ability to deliver
20.5/40.015.2/20 Reviews0/10 Clients & Experience5.3/10 Market PresenceService focus
40% Application Testing20% Performance Testing60% Other -
$5,000+< $25 / hr10 - 49Woking, England
Ability to deliver
23/40.016.2/20 Reviews2.8/10 Clients & Experience4/10 Market PresenceService focus
50% Application Testing10% Performance Testing50% Other -
UndisclosedUndisclosed1,000 - 9,999London, England
Ability to deliver
9.7/40.00/20 Reviews1.2/10 Clients & Experience8.5/10 Market PresenceService focus
100% Application Testing25% Performance Testing -
UndisclosedUndisclosed1,000 - 9,999Reading, England
Ability to deliver
5.7/40.00/20 Reviews0/10 Clients & Experience5.7/10 Market PresenceService focus
50% Application Testing50% Performance Testing50% Other -
$5,000+< $25 / hr10 - 49London, England
Ability to deliver
8.7/40.00/20 Reviews4.2/10 Clients & Experience4.6/10 Market PresenceService focus
60% Application Testing10% Performance Testing40% Other -
$10,000+$25 - $49 / hr50 - 249London, England
Ability to deliver
5.8/40.00/20 Reviews0.6/10 Clients & Experience5.2/10 Market PresenceService focus
100% Application Testing20% Performance Testing -
UndisclosedUndisclosed10 - 49London, England
Ability to deliver
5.8/40.00/20 Reviews0/10 Clients & Experience5.8/10 Market PresenceService focus
80% Application Testing20% Performance Testing20% Other -
UndisclosedUndisclosed50 - 249LE5 4LE, England
Ability to deliver
0/40.00/20 Reviews0/10 Clients & Experience0/10 Market PresenceService focus
50% Application Testing50% Performance Testing50% Other -
UndisclosedUndisclosed50 - 249London, England
Ability to deliver
0/40.00/20 Reviews0/10 Clients & Experience0/10 Market PresenceService focus
70% Application Testing50% Performance Testing30% Other -
UndisclosedUndisclosed1,000 - 9,999London, England
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0/40.00/20 Reviews0/10 Clients & Experience0/10 Market PresenceService focus
50% Application Testing30% Performance Testing50% Other -
UndisclosedUndisclosed1,000 - 9,999Crawley, England
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0/40.00/20 Reviews0/10 Clients & Experience0/10 Market PresenceService focus
25% Application Testing35% Performance Testing75% Other -
UndisclosedUndisclosed50 - 249Basildon, England
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4/40.00/20 Reviews0/10 Clients & Experience4/10 Market PresenceService focus
100% Application Testing20% Performance Testing -
UndisclosedUndisclosed250 - 999Birmingham, England
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0/40.00/20 Reviews0/10 Clients & Experience0/10 Market PresenceService focus
50% Application Testing30% Performance Testing50% Other -
UndisclosedUndisclosed250 - 999London, England
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0/40.00/20 Reviews0/10 Clients & Experience0/10 Market PresenceService focus
30% Application Testing30% Performance Testing70% Other -
$5,000+Undisclosed2 - 9London, England
Ability to deliver
4.6/40.00/20 Reviews0/10 Clients & Experience4.6/10 Market PresenceService focus
100% Application Testing15% Performance Testing -
UndisclosedUndisclosed250 - 999London, England
Ability to deliver
0/40.00/20 Reviews0/10 Clients & Experience0/10 Market PresenceService focus
100% Application Testing20% Performance Testing -
UndisclosedUndisclosed250 - 999London, England
Ability to deliver
0/40.00/20 Reviews0/10 Clients & Experience0/10 Market PresenceService focus
20% Application Testing60% Performance Testing80% Other
UK Performance Testing FAQs
UK-based teams bring proximity to major data centres (London/UK South), familiarity with UK GDPR and sector rules (FCA, Open Banking, NHS standards), and hands-on experience with British peak events like Black Friday, Boxing Day sales, and live sports streaming. That local context helps agencies build credible non-functional requirements, choose realistic test profiles, and align SLAs with your market.
Moreover, you’ll also find deep expertise across open-source and enterprise toolchains (k6, JMeter, Gatling, LoadRunner) and modern cloud-native stacks. For organizations that need close collaboration, a UK partner can co-locate for war rooms, tune infrastructure in-region, and coordinate with SRE and platform engineering in your time zone.
Pricing varies thanks to a myriad of factors, including scope, tool licenses, environments, and compliance needs. According to Clutch’s recent data, most UK-based performance testing firms charge:
- Hourly/day rates: £70 – £150 per hour or £600 – £1,200 per day
- Fixed engagements: £15,000 – £80,000+ for discovery, strategy, scripting, and execution of load and stress testing solutions across key journeys
- Ongoing optimisation: £5,000 – £25,000+ per month for continuous application performance testing, CI/CD integration, and tuning.
Furthermore, expect separate line items for cloud load infrastructure, APM tooling, and any enterprise license fees.
UK-based consultancies support a wide mix of high-traffic, regulated, and real-time use cases such as:
- Financial services and fintech — payments, trading, and Open Banking APIs
- E-commerce and retail — peak readiness for promotions and holidays
- Media, broadcast, and sports streaming — concurrency and latency at scale
- Gaming and entertainment — matchmaking, in-game events, live ops
- Healthcare and the public sector — NHS-scale portals, GOV.UK services
- Travel, transport, and telecom — ticketing, journey planning, network portals
Many firms also provide website performance testing for editorial, membership, and education platforms.
Define the specific requirements and critical objectives of your project to align the search strategy. Then, browse through Clutch’s directories and assess potential partners on:
- Match to your stack — Shortlist partners experienced with your tech.
- Tooling and observability — Look for expertise in k6/Gatling/JMeter/LoadRunner plus APM and logs.
- Test realism — Confirm they can generate traffic from UK regions, handle test data, and model spikes, soak, and degradation patterns.
- Delivery fit — Check if you need onshore-only, hybrid, or managed services; validate their CI/CD integration and reporting cadence.
- Proof of impact — Review UK case studies, references in your vertical, and sample reports with clear bottleneck analysis and tuning plans.
Use Clutch filters for budget, location, industry, and “performance testing consultancy UK” focus to quickly narrow the field.
- One-size-fits-all scripts with no discovery or baseline
- No plan for production-like environments, data, or third-party dependencies
- Over-reliance on a single tool without explaining trade-offs
- Vague reporting, no root-cause analysis, or no remediation guidance
- Hidden costs for licenses or cloud load generators
- Guaranteed percentage gains before reviewing your architecture
- Ignoring security of test data or UK GDPR obligations
- Limited knowledge of load testing services beyond basic concurrency
The UK is home to many exceptional firms, so there’s no need to worry about running out of options. Be objective and meticulous when assessing possible partners for your testing project.