--- title: How we test web portals and APIs under load | TEST4NET description: "Web portals and APIs on the CloudLAB bench: journeys for 1,000 to 200,000 users, ramp-up, RPS to the first error, p95 and p99, TLS, soak, the weak layer" image: https://test4net.com/hubfs/blog-covers/how-we-test-web-portals-under-load.png --- [Skip to content](https://test4net.com/blog/how-we-test-web-portals-under-load#main-content) [![TEST4NET](https://test4net.com/hubfs/test4net-logo-fixed-2.svg)](https://test4net.com/?hsLang=en) - Services - Products - Resources - Company - [English](https://test4net.com/blog/how-we-test-web-portals-under-load) - [Русский](https://test4net.com/ru/blog/how-we-test-web-portals-under-load) - [Հայերեն](https://test4net.com/hy/blog/how-we-test-web-portals-under-load) [News](https://test4net.com/news?hsLang=en) [Login](https://lab.test4net.com) [Support](https://test4net.com/support?hsLang=en) - [English](https://test4net.com/blog/how-we-test-web-portals-under-load) - [Русский](https://test4net.com/ru/blog/how-we-test-web-portals-under-load) - [Հայերեն](https://test4net.com/hy/blog/how-we-test-web-portals-under-load) What we test By technology Industries [Load & Performance Testing Throughput, sessions and latency up to and past the rated limit](https://test4net.com/services/load-performance-testing?hsLang=en) [Functional & Conformance Testing Features against the spec, RFC compliance with evidence](https://test4net.com/services/functional-conformance-testing?hsLang=en) [Interoperability Testing Multi-vendor behaviour, before it reaches production](https://test4net.com/services/interoperability-testing?hsLang=en) [Security & Resilience Testing NGFW, IPS and VPN efficacy and performance with threats on the wire](https://test4net.com/services/security-resilience-testing?hsLang=en) [Test Plan & Methodology Design What to test, how, and what counts as a pass](https://test4net.com/services/test-plan-design?hsLang=en) [Test Automation & CI/CD Regression suites wired into your release pipeline](https://test4net.com/services/test-automation?hsLang=en) [Training Programs Hands-on courses for your test engineers](https://test4net.com/services/training-programs?hsLang=en) [Equipment Repair Repair and verification of test equipment](https://test4net.com/services/equipment-repair?hsLang=en) [All services](https://test4net.com/services?hsLang=en) [Routing & Switching RFC 2544 and RFC 2889 on real ports, 1G to 100G](https://test4net.com/solutions/routing-switching?hsLang=en) [Firewalls & NGFW RFC 9411 throughput with inspection switched on](https://test4net.com/solutions/firewalls-ngfw?hsLang=en) [SD-WAN & WAN Path selection and QoS under emulated WAN conditions](https://test4net.com/solutions/sd-wan?hsLang=en) [Cloud & NFV Virtual appliances and cloud services under load](https://test4net.com/solutions/cloud-nfv?hsLang=en) [5G & Mobile Core Transport and core functions under subscriber traffic](https://test4net.com/solutions/5g-mobile-core?hsLang=en) [Wi-Fi Wi-Fi 6 clients and access points, Wi-Fi 7 in progress](https://test4net.com/solutions/wi-fi?hsLang=en) [Storage & Infrastructure Storage networks and servers under realistic I/O](https://test4net.com/solutions/storage?hsLang=en) [AI / Switching Fabric (RoCEv2) Lossless Ethernet for GPU clusters: PFC, ECN, fabric load](https://test4net.com/solutions/ai-fabric-rocev2?hsLang=en) [All technologies](https://test4net.com/services#coverage) [Telecom Operators Pre-deployment acceptance and vendor comparison](https://test4net.com/solutions/industries#telecom) [Network & Security Vendors Independent validation of your product claims](https://test4net.com/solutions/industries#vendors) [System Integrators Proof for the customer before the rollout](https://test4net.com/solutions/industries#integrators) [Enterprise & Banks Upgrades and new platforms checked before production](https://test4net.com/solutions/industries#enterprise) [All industries](https://test4net.com/solutions/industries?hsLang=en) Not sure where to start? 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Then at 9:00 a few thousand people log in, search and submit forms at once, and the login service runs out of database connections. The home page came from the cache all along. We load a portal the way its users work with it and look for the layer that gives up first. ## The bench The portal stays where it runs: your cloud tenant, your data centre or a staging copy on the bench hypervisor. The load comes from the L4-7 engines of the bench, commercial generators and the one we build ourselves, over a real cloud connection or a dedicated link. Each emulated user has its own test account, source address and TLS session, so caches, session stickiness and rate limits behave as they do with real people. Portals with the infrastructure in front of them are one of the classes on the [cloud and NFV](https://test4net.com/solutions/cloud-nfv?hsLang=en) page. The journeys come from your logs: login, search, an account page, a form, the API calls of the mobile app, with real pauses between clicks and a share of the mix for each. The counters of every layer are recorded during the run: load balancer, WAF, application, database, and the CDN if one sits in the path. ## What we check - Ramp-up: 1,000 to 200,000 concurrent users in steps, a hold at each, and the step where the portal leaves the agreed band - Requests per second to the first error: HTTP 5xx, timeouts, refused connections, then the error rate at each step - Response time per transaction: p50, p95 and p99 for login, search, the form and each API call - Content checks: a 200 with an error page inside counts as a failure - TLS: handshakes per second where TLS ends (load balancer, WAF or application) during a login rush - The layer that saturates: connections on the load balancer, latency the WAF adds with the full rule set, application pools, database queries and locks - Soak: 2 to 24 hours at a steady load, the last hour against the first - Cloud against on-prem: how long autoscaling takes and what p99 does meanwhile, the same journeys on both, the cloud bill of the run Pass criteria are agreed before the run. Ramp and soak follow the method of our [load and performance tests](https://test4net.com/services/load-performance-testing?hsLang=en), and a WAF or a load balancer can also be measured on its own as a [device class](https://test4net.com/solutions/firewalls-ngfw?hsLang=en). ## What usually breaks Most often the database. An example with round numbers: the application scales from 4 to 12 instances with a pool of 50 connections each, and the database accepts 300. At about 6,000 users the new instances wait for connections, p99 of the login grows from 0.8 to 9 seconds, and the CPU of the web tier stays green. More instances only ask for more connections. Second: autoscaling that reacts late. A new instance comes after 5 minutes above 70% CPU and needs 3 more to warm up, while the morning rush lasts 10. For 8 of those minutes the portal runs on the capacity it had at 8:59. Third: the path in front. Stickiness by source address sends a whole office behind one NAT to one server. The WAF adds 40 ms at p99 (an example) and runs out of CPU before the application. TLS ends on a load balancer sized for page views, and the morning login turns into a handshake storm. 3 machines sending load to one URL show none of this. ## What is in the report A table per load step: users, requests per second, p50, p95 and p99 per transaction, errors by type. The layer that saturated first, with its counters at that moment. TLS figures, the soak curve, the autoscaling timeline and the cost of a cloud run. The journeys and the generator settings are in the report, so the rerun after a fix is the same test. ## Where to start Send us the portal, the 3 to 5 journeys your business depends on and the load you expect at the busiest hour. We answer with a draft plan: the journeys, the load steps, how the bench is built and the dates. The report is yours to keep and to show to the developer or the hosting provider. [Write to us](https://test4net.com/contacts?hsLang=en) or look at [what else the bench does](https://test4net.com/services?hsLang=en). Share Pass it on to someone who runs a network Independent lab data is most useful in the hands of the people who make the call. Send this piece to a colleague. 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With 19+ years in performance and load testing on IXIA, Spirent, Keysight, Xena and Xinertel platforms, he runs NGFW, WAF, IPS, DLP and SASE evaluations for telecom operators, banks and system integrators. [LinkedIn](https://www.linkedin.com/in/azemskov/) [Website](https://test4net.com/?hsLang=en) [Previous article How we test failover and convergence: the loss window per flow](https://test4net.com/blog/how-we-test-failover-and-convergence?hsLang=en) [Next article How we test 5G transport: GTP-U, delay per class, a cut link](https://test4net.com/blog/how-we-test-5g-transport?hsLang=en) In this article On the bench ### Have a device to put through this? Send us the shortlist and the KPIs that decide it. We will come back with a scoped test plan, a timeline and a fixed price. [Talk to a test engineer](https://test4net.com/contacts?hsLang=en) Blog ## Keep reading [![How we test hyperconverged clusters: a lost node and VM p99](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-hyperconverged-clusters.png?width=880&height=550&name=how-we-test-hyperconverged-clusters.png)](https://test4net.com/blog/how-we-test-hyperconverged-clusters?hsLang=en) [Storage and data center](https://test4net.com/blog/tag/storage-and-data-center) ### [How we test hyperconverged clusters: a lost node and VM p99](https://test4net.com/blog/how-we-test-hyperconverged-clusters?hsLang=en) An HCI sizing sheet answers one question: how many VMs fit on 4 nodes with one node in reserve. It is calculated on a healthy cluster. A buyer reads "N+1" and expects a l… ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 30, 2026 · 5 min read [![How we test NAS over NFS and SMB: metadata calls and failover](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-nas-file-shares.png?width=880&height=550&name=how-we-test-nas-file-shares.png)](https://test4net.com/blog/how-we-test-nas-file-shares?hsLang=en) [Storage and data center](https://test4net.com/blog/tag/storage-and-data-center) ### [How we test NAS over NFS and SMB: metadata calls and failover](https://test4net.com/blog/how-we-test-nas-file-shares?hsLang=en) A NAS datasheet gives one figure: sequential read in GB/s, taken with large files and a few clients. On a home-directory share or a build farm, hundreds of clients create… ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 30, 2026 · 4 min read [![How we test backup and replication over WAN: the window and RPO](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-backup-and-replication-over-wan.png?width=880&height=550&name=how-we-test-backup-and-replication-over-wan.png)](https://test4net.com/blog/how-we-test-backup-and-replication-over-wan?hsLang=en) [Storage and data center](https://test4net.com/blog/tag/storage-and-data-center) ### [How we test backup and replication over WAN: the window and RPO](https://test4net.com/blog/how-we-test-backup-and-replication-over-wan?hsLang=en) The sizing sheet divides the data by the link: 20 TB over a 10G WAN is 4.4 hours, the window from 22:00 to 07:00 is 9, so the margin looks double. Over 30 ms of RTT with … ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 30, 2026 · 4 min read [![TEST4NET LLC](https://test4net.com/hubfs/test4net-logo-fixed.svg)](https://test4net.com?hsLang=en) Independent testing and validation for telecom, information security and cloud infrastructure – real insights, not assumptions [mailto:sales@test4net.com](mailto:sales@test4net.com) #### Navigate - [Home](https://test4net.com/?hsLang=en) - [Why TEST4NET](https://test4net.com/why-test4net?hsLang=en) - [About us](https://test4net.com/about?hsLang=en) - [Contact](https://test4net.com/contacts?hsLang=en) - [Blog](https://test4net.com/blog?hsLang=en) - [Industry News](https://test4net.com/news?hsLang=en) #### Get in touch Sales [sales@test4net.com](mailto:sales@test4net.com) Support [support.test4net.com](https://support.test4net.com) © 2026 TEST4NET LLC. All rights reserved. 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