--- title: How we test application QoE through the network | TEST4NET description: "Application QoE on the CloudLAB bench: emulated users with think time, page and API time per user, DNS, TLS and TTFB phases, p95 across users, bulk traffic on" image: https://test4net.com/hubfs/blog-covers/how-we-test-application-qoe.png --- [Skip to content](https://test4net.com/blog/how-we-test-application-qoe#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-application-qoe) - [Русский](https://test4net.com/ru/blog/how-we-test-application-qoe) - [Հայերեն](https://test4net.com/hy/blog/how-we-test-application-qoe) [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-application-qoe) - [Русский](https://test4net.com/ru/blog/how-we-test-application-qoe) - [Հայերեն](https://test4net.com/hy/blog/how-we-test-application-qoe) 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) [Load Balancers & ADC Connections, TLS and failover of the pair under load](https://test4net.com/solutions/load-balancers-adc?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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On Monday the CRM page takes 4 seconds to open at the branch, and the ticket says "the network is slow". Both are right: the acceptance ran test streams over an empty link, and the user opens a page of 80 objects over HTTPS through a proxy while a backup fills the same link. We measure what each emulated user waits for, transaction by transaction, with the rest of the traffic on. ## The bench The path goes onto the CloudLAB bench as it runs in production: branch router or SD-WAN edge, NGFW or proxy with your policy, Wi-Fi access point, WAN link. [WANemu](https://test4net.com/products/wanemu?hsLang=en) gives the link its delay, jitter, loss and bandwidth cap per direction, from the measured profile of your provider. On the far side the bench emulates the servers: web pages with many objects, SaaS-like APIs over TLS, file shares, mail, DNS. They answer in a fixed time, so every millisecond that moves between runs comes from the path. Each emulated user has its own address, DNS lookups, TCP and TLS sessions and a think time between clicks, and runs a script of real transactions: a page, an API call, a file download and upload, a mail. The mix and the bulk share (backups, updates, video) come from your NetFlow or the app-mix library of our [traffic generator](https://test4net.com/products/traffic-generator?hsLang=en). ## What we check - Time per user for each transaction type: p50, p95 and p99 across users against a target agreed before the run - Phases: DNS lookup, TCP and TLS handshakes, time to first byte, transfer, so the slow second has an address - Failures: timeouts, resets, HTTP errors, a 200 with an error or block page inside - Goodput per user, and how evenly the link is shared when many users pull files at once - Bulk traffic: a backup fills the link; interactive transactions timed before, during and after, QoS off and on - Distance: the same scripts at the delay, jitter and loss of each branch type, and the RTT where a transaction leaves its target - Features on the path: TLS inspection, URL filtering, application control, proxy authentication switched on one by one, with the milliseconds each adds - User count: steps up to the headcount of the largest site, and the step where p95 leaves the band Throughput stays in the report as context; the verdict is in user terms, for example "the CRM page at p95 under 2 s for 300 users at a branch 60 ms away". ## What usually breaks Round trips. In a typical project a CRM page opens in 1 s at the head office and in 4 s at a branch 60 ms away, with the link a fifth full (example numbers). The page makes about 50 sequential round trips: DNS for several hosts, a redirect, TLS through the proxy, objects a few at a time. 50 × 60 ms is 3 s, and a wider link removes none of them. Counted per transaction, the round trips send the fix to the application or the proxy, and the bigger link stays unbought. The queue. A daytime backup fills the buffer of the WAN edge, and the RTT under it grows from 20 to 200 ms (an example). Each of those 50 round trips costs 10 times more, p95 of the page passes 10 s, and average link use looks healthy. A QoS class or a shaper with a short queue brings it back; we time it before and after, as in [our QoS tests](https://test4net.com/blog/how-we-test-qos?hsLang=en). Inspection at peak. With TLS inspection on the [firewall](https://test4net.com/solutions/firewalls-ngfw?hsLang=en), each connection has two handshakes, to it and from it. At 9:00, with hundreds of logins at once, the box nears its handshake limit and the TLS phase of some users grows from tens of milliseconds to over a second. The average hides it, p99 shows it. DNS fails as quietly: a branch resolver drops queries under load, and the client waits 1 to 5 s to retry before the page starts. ## What is in the report For every transaction type: p50, p95 and p99 across users per user step, impairment profile and feature set, with the phases broken out. Failures by cause, goodput per user, the same tables with bulk traffic off and on. The scripts, think times, mix weights and emulator settings, so the run repeats after the fix or with a competing box. ## Where to start Send us the applications your users complain about, the sites they work from and what sits on the path. We answer with a draft test plan: the items, the bench layout and the dates. The report is yours to keep and to show to the vendor. [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. [LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-application-qoe) [X](https://twitter.com/intent/tweet?url=https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-application-qoe&text=How+we+test+application+QoE%3A+transaction+time+per+user) [Telegram](https://t.me/share/url?url=https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-application-qoe&text=How+we+test+application+QoE%3A+transaction+time+per+user) [WhatsApp](https://wa.me/?text=How+we+test+application+QoE%3A+transaction+time+per+user%20https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-application-qoe) Copy link More apps ![](https://test4net.com/hubfs/IMG_0070.jpg) Written by ### [Alexander Zemskov](https://test4net.com/blog/author/az) Alexander Zemskov leads network and security testing at TEST4NET, an independent, vendor-neutral testing lab in Yerevan, Armenia. 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 video QoE: start-up, stalls and channel zap time](https://test4net.com/blog/how-we-test-video-streaming-qoe?hsLang=en) [Next article How we test CGNAT: translations per second, port blocks and logs](https://test4net.com/blog/how-we-test-cgnat?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 measure power under load: watts per Gbps at 4 load steps](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-measure-power-under-load.png?width=880&height=550&name=how-we-measure-power-under-load.png)](https://test4net.com/blog/how-we-measure-power-under-load?hsLang=en) [Standards and methodology](https://test4net.com/blog/tag/standards-and-methodology) ### [How we measure power under load: watts per Gbps at 4 load steps](https://test4net.com/blog/how-we-measure-power-under-load?hsLang=en) The datasheet of a switch, router or firewall gives two power figures: "typical" and "maximum". Neither says at what load, with which optics or at what inlet temperature.… ![](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 remote-access VPN: 9:00 logins, MFA and failover](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-remote-access-vpn.png?width=880&height=550&name=how-we-test-remote-access-vpn.png)](https://test4net.com/blog/how-we-test-remote-access-vpn?hsLang=en) [Security](https://test4net.com/blog/tag/security-performance) ### [How we test remote-access VPN: 9:00 logins, MFA and failover](https://test4net.com/blog/how-we-test-remote-access-vpn?hsLang=en) A VPN concentrator datasheet gives a user count and a throughput figure, both taken separately: thousands of idle tunnels for the first, a few fat ones for the second. A … ![](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 IPv6 and transition: dual stack, NAT64, 464XLAT](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-ipv6-transition.png?width=880&height=550&name=how-we-test-ipv6-transition.png)](https://test4net.com/blog/how-we-test-ipv6-transition?hsLang=en) [Routing and switching](https://test4net.com/blog/tag/routing-and-switching) ### [How we test IPv6 and transition: dual stack, NAT64, 464XLAT](https://test4net.com/blog/how-we-test-ipv6-transition?hsLang=en) A router datasheet shows IPv6 as a tick next to IPv4, with one throughput figure for both. On the bench the two protocols often part ways: at small packets, with an exten… ![](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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