www.energy.gov speed test — 20 Oct 2026
Measured from the wfix.shop server on 20 October 2026 at 13:12 UTC. Grade C (74/100), with the screenshots, the timings and the fixes that matter.
Where the first byte went
- DNS lookup 84 ms 35%
- TCP connect 35 ms 14%
- Server wait 123 ms 51%
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 242 ms. That is workable, and the cheapest win left is caching or a warmer connection.
- The page transfers 10.73 MB over 26 request(s). Images files are 61% 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.
- The largest element painted at 1.53 s, inside the 2.5 s Google calls good.
- Layout stayed still (CLS 0.001), so nothing jumps under the reader's cursor.
- The main thread was blocked for 139 ms in total, which is not enough to feel.
Fix first: Image delivery and format - 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.
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.
Screenshot
What the page looks like
Loaded in headless Chromium on this server. Click an image to open it full size.
Browser render
The same URL loaded in a real browser, so these are the readings curl cannot produce. The grade above is still built from the server measurements.
Page weight by type
What the page is made of
Transfer size, compressed as sent. 26 request(s) in total, 10.73 MB across all of them.
Top issues
Image delivery and format
high impact3 image(s) over 200 KB and 3 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 (4 script(s), 2 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 10.73 MB across 26 request(s), with the document itself at 30.7 KB.
Fix: Work through the heaviest assets first: images, then fonts, then third-party scripts.
JavaScript weight
medium impact6 JavaScript file(s) over 200 KB: duotone.js (794.7 KB), duotone-regular.js (1.02 MB), solid.js (665.6 KB), regular.js (837.7 KB)
Fix: Split routes, remove unused dependencies, and prefer a two-file build (one pinned library, one application bundle) over many small ones.
Avoid extra redirects
medium impact1 redirect hop(s) before the page load started, each one a full round trip before the first byte.
Fix: Link to the canonical URL (and make sure http, the apex domain and www all point at it) so no visitor pays a redirect first.
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://www.energy.gov/modules/contrib/google_tag/js/gtag.js?tn75rl | javascript | 200 | 1.06 s | 625 B |
| https://www.energy.gov/themes/custom/energy_gov/js/fontawesome/duotone.js | javascript | 200 | 1.04 s | 794.7 KB |
| https://www.energy.gov/themes/custom/energy_gov/js/fontawesome/duotone-regular.js | javascript | 200 | 1.01 s | 1.02 MB |
| https://www.energy.gov/themes/custom/energy_gov/js/fontawesome/solid.js | javascript | 200 | 993 ms | 665.6 KB |
| https://www.energy.gov/themes/custom/energy_gov/js/fontawesome/regular.js | javascript | 200 | 989 ms | 837.7 KB |
| https://www.energy.gov/ruxitagentjs_A7NVfgqrux_10343260715123811.js | javascript | 200 | 988 ms | 68.9 KB |
| https://www.energy.gov/modules/contrib/google_tag/js/gtm.js?tn75rl | javascript | 200 | 983 ms | 651 B |
| https://www.energy.gov/sites/default/files/js/js_Rhn_8SX-Sd4o-TDsK6lxobce5XUf2rnZZsNJ3sScDsw.js?scope=header&delta=0&language=en&theme=energy_gov&include=eJyFjl1uxDAIhC8ULS-9jzVxKEtD7MiQdHP7ZqtY_VGlviDNNwMMlKBJrI6wYULAcHCjke_YtTYfuHCTI6HAjtDsJHhJ2TTPiXcukaIhz1rk7-S_mVrF-Av0RK4lzk26JD_CtMzdlboT3Dn8O_HVdOJOFp4UlDePujzPvapsjdNo9az-afakM1q-E9Z1uP7Q1LYVdutvr5YBITnHb33DGx4_4TK4Br-ffRKMW5AWjQ8Lio-_ | javascript | 200 | 983 ms | 246 B |
| https://www.energy.gov/themes/custom/energy_gov/js/fontawesome/brands.js | javascript | 200 | 982 ms | 213.2 KB |
| https://www.energy.gov/sites/default/files/js/js_2u0_ap9zYQcReKOK02T08J8ez5yczTnyyBTutOkcIic.js?scope=footer&delta=2&language=en&theme=energy_gov&include=eJyFjl1uxDAIhC8ULS-9jzVxKEtD7MiQdHP7ZqtY_VGlviDNNwMMlKBJrI6wYULAcHCjke_YtTYfuHCTI6HAjtDsJHhJ2TTPiXcukaIhz1rk7-S_mVrF-Av0RK4lzk26JD_CtMzdlboT3Dn8O_HVdOJOFp4UlDePujzPvapsjdNo9az-afakM1q-E9Z1uP7Q1LYVdutvr5YBITnHb33DGx4_4TK4Br-ffRKMW5AWjQ8Lio-_ | javascript | 200 | 975 ms | 137.1 KB |
| https://www.energy.gov/themes/custom/energy_gov/js/fontawesome/fontawesome.js | javascript | 200 | 971 ms | 24.8 KB |
| https://www.energy.gov/modules/custom/energy_search/js/search-uswds/build/static/js/bundle.js?tn75rl | javascript | 200 | 969 ms | 340.4 KB |
| https://www.energy.gov/sites/default/files/js/js_8dhuzHVm0Mk4UF0LmJJdEj6VHQqJCNq8QWA0xThSnG0.js?scope=footer&delta=4&language=en&theme=energy_gov&include=eJyFjl1uxDAIhC8ULS-9jzVxKEtD7MiQdHP7ZqtY_VGlviDNNwMMlKBJrI6wYULAcHCjke_YtTYfuHCTI6HAjtDsJHhJ2TTPiXcukaIhz1rk7-S_mVrF-Av0RK4lzk26JD_CtMzdlboT3Dn8O_HVdOJOFp4UlDePujzPvapsjdNo9az-afakM1q-E9Z1uP7Q1LYVdutvr5YBITnHb33DGx4_4TK4Br-ffRKMW5AWjQ8Lio-_ | javascript | 200 | 968 ms | 12.8 KB |
| https://www.energy.gov/themes/custom/energy_gov/svg/footer-logo.svg | images | 200 | 967 ms | 61.6 KB |
| https://www.energy.gov/sites/default/files/js/js_p3crYNw3ynKtr3NaCAF1uuncIQ-v_SD8k4o_F9Zlo_Y.js?scope=footer&delta=0&language=en&theme=energy_gov&include=eJyFjl1uxDAIhC8ULS-9jzVxKEtD7MiQdHP7ZqtY_VGlviDNNwMMlKBJrI6wYULAcHCjke_YtTYfuHCTI6HAjtDsJHhJ2TTPiXcukaIhz1rk7-S_mVrF-Av0RK4lzk26JD_CtMzdlboT3Dn8O_HVdOJOFp4UlDePujzPvapsjdNo9az-afakM1q-E9Z1uP7Q1LYVdutvr5YBITnHb33DGx4_4TK4Br-ffRKMW5AWjQ8Lio-_ | javascript | 200 | 965 ms | 252 B |
| https://www.energy.gov/themes/custom/energy_gov/img/logo-image.png | images | 200 | 964 ms | 89.8 KB |
| https://www.energy.gov/themes/custom/energy_gov/js/fontawesome/custom-icons.js | javascript | 200 | 963 ms | 57.9 KB |
| https://www.energy.gov/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 | javascript | 200 | 963 ms | 26.9 KB |
| https://www.energy.gov/themes/custom/energy_gov/assets/img/icon-https.svg | images | 200 | 963 ms | 720 B |
| https://www.googletagmanager.com/ns.html?id=GTM-PCSS9JS 3rd party | html | 200 | 963 ms | 92 B |
| https://www.energy.gov/sites/default/files/2025-12/Oil%20and%20gas%20transport.jpeg | images | 200 | 957 ms | 5.05 MB |
| https://www.energy.gov/sites/default/files/2025-07/JAMES_DANLY_SQ.jpg | images | 200 | 956 ms | 832.2 KB |
| https://www.energy.gov/sites/default/files/2025-02/CHRIS_WRIGHT_PORTRAIT_SQ.jpg | images | 200 | 955 ms | 574.5 KB |
| https://www.energy.gov/themes/custom/energy_gov/assets/img/us_flag_small.png | images | 200 | 952 ms | 244 B |
| https://www.energy.gov/themes/custom/energy_gov/assets/img/icon-dot-gov.svg | images | 200 | 950 ms | 633 B |
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