www.who.int speed test — 20 Oct 2026
Measured from the wfix.shop server on 20 October 2026 at 12:48 UTC. Grade D (67/100), with the screenshots, the timings and the fixes that matter.
Where the first byte went
- DNS lookup 75 ms 25%
- TCP connect 56 ms 19%
- Server wait 167 ms 56%
Measured on the connection that fetched the HTML. Every other request on the page waits for the end of this bar before it can start.
How this page compares
Every report published here is in this comparison, so it is a reference population of pages tested from one server - not a benchmark of the whole web.
What these numbers mean
- The first byte arrived in 298 ms. That is workable, and the cheapest win left is caching or a warmer connection.
- The page transfers 11.16 MB over 26 request(s). Images files are 63% of it, so resize and recompress the largest images before anything else.
- The HTML itself arrives gzip-compressed.
- It runs over HTTP/3, so the assets share a connection instead of opening one each.
- 99% of the weight comes from other hosts (analytics, fonts, embeds), which also means their slow day becomes your slow day.
Fix first: Compress text responses - Turn on brotli (preferred) or gzip for text/css, javascript and text/html in the web server. This is the cheapest win available on almost any site.
Read on one shared server, not a visitor's phone: use it to compare pages against each other, not as a promise about every connection. We fix what these tests find.
The headless browser did not capture this page when the test ran, so only the server measurements are shown.
Page weight by type
What the page is made of
Transfer size, compressed as sent. 26 request(s) in total, 11.16 MB across all of them.
Top issues
Compress text responses
high impact2 text response(s) of 10 KB or more are sent uncompressed, and the document itself is not compressed. That is 3.96 MB of compressible text.
Fix: Turn on brotli (preferred) or gzip for text/css, javascript and text/html in the web server. This is the cheapest win available on almost any site.
Image delivery and format
high impact11 image(s) over 200 KB and 14 large image(s) still served as JPEG or PNG.
Fix: Serve WebP or AVIF with a JPEG fallback, size images to the space they occupy, and lazy-load anything below the fold. Images are usually more than half of a slow page.
Render-blocking resources
high impact6 render-blocking resource(s) in the document head (0 script(s), 6 stylesheet(s)). The page cannot paint until each one arrives.
Fix: Add defer or async to scripts that do not change the first paint, inline the critical CSS, and load the rest with media="print" plus an onload swap.
Total page weight
high impactThe page transfers 11.16 MB across 26 request(s), with the document itself at 23.4 KB.
Fix: Work through the heaviest assets first: images, then fonts, then third-party scripts.
Cache static assets
medium impact2 asset(s) answer without a Cache-Control max-age, so browsers revalidate them on every visit.
Fix: Version filenames on change and serve them with a long max-age plus immutable. That is what makes a returning visitor fast.
Waterfall
Slowest requests
Each bar is one request's own response time, scaled to the slowest. Assets were fetched in parallel, so the bars overlap in real time rather than stacking. first party third party
| Request | Type | Status | Time | Size |
|---|---|---|---|---|
| https://cdn.who.int/media/images/default-source/south-east-asia-(searo)/countries/india/who-field-teams-assisted-the-bihar-state-health-department-in-delivering-bivalent-oral-polio-(bopv)-vaccines-in-difficult-to-reach-areas-during-national-immunization-day-on-24-november.jpg?sfvrsn=7ba755ee_4 3rd party | images | 200 | 1.24 s | 389.8 KB |
| https://cdn.who.int/media/images/default-source/who_homepage/dg-speech-wha76-roundtable.jpg?sfvrsn=9efc4b31_14 3rd party | images | 200 | 1.21 s | 397.7 KB |
| https://cdn.who.int/media/images/default-source/topics/womens-childrens-and-adolescent-health/womens-health/women-on-beach.jpg?sfvrsn=8b5ad3ba_4 3rd party | images | 200 | 1.21 s | 784.0 KB |
| https://cdn.who.int/media/images/default-source/topics/diseases-and-conditions/ebola-virus/safe-and-dignified-burial-in-ituri-province.jpg?sfvrsn=6e2fd733_3 3rd party | images | 200 | 1.17 s | 483.8 KB |
| https://cdn.who.int/media/images/default-source/cover-images/publications/publications-hero-image.jpg?sfvrsn=cc9235b3_15 3rd party | images | 200 | 1.15 s | 115.2 KB |
| https://cdn.who.int/media/images/default-source/headquarters/campaigns/world-diabetes-day/2026/shopping-at-the-market.jpg?sfvrsn=8f6a860d_6 3rd party | images | 200 | 934 ms | 647.7 KB |
| https://cdn.who.int/media/images/default-source/topics/diseases-and-conditions/cancer/womens-integrated-cancer-services-kenya22.tmb-768v.jpg?sfvrsn=db3ecd3d_2 3rd party | images | 200 | 917 ms | 127.4 KB |
| https://cdn.who.int/media/images/default-source/topics/determinants-of-health/environmental-health/36288.jpg?sfvrsn=c3fd611c_3 3rd party | images | 200 | 899 ms | 792.4 KB |
| https://cdn.who.int/media/images/default-source/headquarters/teams/external-relations-governance-(ext)/department-of-communications-(dco)/digital-social-visual-(dsv)/who-logo-at-headquarters.jpg?sfvrsn=34ba81d2_10 3rd party | images | 200 | 892 ms | 266.5 KB |
| https://kendo.cdn.telerik.com/2021.1.119/js/kendo.all.min.js 3rd party | javascript | 200 | 891 ms | 3.72 MB |
| https://cdn.who.int/media/images/default-source/headquarters/campaigns/world-blood-donor-day/2026/enhypen-members-at-a-blood-donation-centre.jpg?sfvrsn=e0c19771_4 3rd party | images | 200 | 887 ms | 456.4 KB |
| https://www.who.int/ScriptResource.axd?d=74FHISOx3fOPKwLxL0RMYsy5CZ1ciqpScg89mHaoCwqm0f3BwT2yIdaPnYAdmSwbYEK1ZSsInvrc-K4nfMcj996OJpQwEQ_jiE7tNvBDDNTsWHMs1V-SmrapMyE1jEszh3aIe8dDrVFevv5g4Az8_4JW2NKXOBG4ECPm9aUN8Tqvcq1P0&t=ffffffff844ef973 | javascript | 200 | 884 ms | 5.5 KB |
| https://kendo.cdn.telerik.com/2021.1.119/js/kendo.timezones.min.js 3rd party | javascript | 200 | 883 ms | 251.6 KB |
| https://cdn.who.int/media/images/default-source/topics/diseases-and-conditions/coronavirus-disease/who-covid-19-preparedness-and-response-bangladesh-2020.jpg?sfvrsn=eda2aa46_13 3rd party | images | 200 | 882 ms | 1.05 MB |
| https://cdn.who.int/media/images/default-source/emergencies-and-disasters/2023---conflict-in-israel-and-the-occupied-palestinian-territory/who-staff-with-baby-in-gaza.jpg?sfvrsn=6a6934ed_3 3rd party | images | 200 | 881 ms | 185.6 KB |
| https://www.who.int/ResourcePackages/WHO/assets/dist/images/logos/en/h-logo-white.svg | images | 200 | 876 ms | 6.7 KB |
| https://cdn.who.int/media/images/default-source/headquarters/campaigns/international-lead-poisoning-prevention-week-of-action/2025/25647-screen-use-(1920-px).jpg?sfvrsn=bdb38aef_3 3rd party | images | 200 | 850 ms | 941.4 KB |
| https://cdnjs.cloudflare.com/ajax/libs/gsap/3.11.4/gsap.min.js 3rd party | javascript | 200 | 850 ms | 24.6 KB |
| https://cdn.who.int/media/images/default-source/who_homepage/nurse-with-covid-vaccine-vial.jpg?sfvrsn=f3c5d966_13 3rd party | images | 200 | 849 ms | 518.7 KB |
| https://cdnjs.cloudflare.com/ajax/libs/gsap/3.11.4/ScrollTrigger.min.js 3rd party | javascript | 200 | 849 ms | 14.6 KB |
| https://www.who.int/images/default-source/fallback/header-logos/h-logo-blue1820eae93c154e37b2588ab90fdbc17e.svg?sfvrsn=aaed4f35_20 | images | 200 | 849 ms | 6.8 KB |
| https://www.who.int/ResourcePackages/WHO/assets/dist/images/logos/en/h-logo-blue.svg | images | 200 | 849 ms | 6.7 KB |
| https://www.who.int/ScriptResource.axd?d=BipRCKUteAIr0PTUVR7xo6LCrTtac4Cof8FsWeF6Rs8EdDSOktcsIs7LNHQe0q9fjlWLg7K_ACXChvDiB89LssRRoiAaWPfFtKZ5o-YMiaG0eBABoldv--hS66lgbT7E3_ovT6krZJ6OXhPP-uxrsovsKl2AJ6Y1yCcYG8mHshUopGyI0&t=ffffffff844ef973 | javascript | 200 | 848 ms | 65.2 KB |
| https://www.who.int/ScriptResource.axd?d=6DQe8ARl7A9TiuWej5ttChzH_bH_8oN_s_nT_Gi4bPGf8e5n2fEMKPjzLdvKHVty-4ZMcWf8z4wR7Uoe9uwfRcpGME2zu76GUYKLUjE5oVOWl9suUmdsLOBTG0SyiZPAlK9FJAXJhhse1qDM4EhvGTqNsxl81NUrAtHLeXR4O4h0ZoaW0&t=ffffffff844ef973 | javascript | 200 | 848 ms | 31.6 KB |
| https://www.who.int/ResourcePackages/WHO/assets/dist/scripts/responsivelylazy.min.js | javascript | 200 | 848 ms | 2.0 KB |
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