www.xfinity.com/national speed test — 20 Oct 2026
Measured from the wfix.shop server on 20 October 2026 at 12:35 UTC. Grade C (78/100), with the screenshots, the timings and the fixes that matter.
Where the first byte went
- DNS lookup 66 ms 27%
- TCP connect 23 ms 9%
- Server wait 154 ms 63%
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 244 ms. That is workable, and the cheapest win left is caching or a warmer connection.
- The page transfers 2.02 MB over 26 request(s). Javascript files are 65% of it, so defer what is not needed for the first screen, and drop tags nobody uses.
- The HTML itself arrives gzip-compressed.
- It runs over HTTP/3, so the assets share a connection instead of opening one each.
- 34% of the weight comes from other hosts (analytics, fonts, embeds), which also means their slow day becomes your slow day.
- The largest element painted at 764 ms, inside the 2.5 s Google calls good.
- Layout stayed still (CLS 0.029), so nothing jumps under the reader's cursor.
- The main thread was blocked for 1.39 s, so taps and scrolling wait while scripts run.
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, 2.02 MB across all of them.
Top issues
Image delivery and format
high impact1 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.
Total page weight
high impactThe page transfers 2.02 MB across 26 request(s), with the document itself at 39.4 KB.
Fix: Work through the heaviest assets first: images, then fonts, then third-party scripts.
Cache static assets
medium impact6 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.
Third-party weight
medium impact4 third-party host(s) serve 711.1 KB of this page. Each one is another DNS lookup, TLS handshake and point of failure you do not control.
Fix: Self-host the libraries you can, drop the tags you cannot justify, and preconnect the ones you keep.
JavaScript weight
medium impact2 JavaScript file(s) over 200 KB: 2726.83a8820b43722829d0b7.js (865.7 KB), main.0b754565a3617d10233d.js (425.8 KB)
Fix: Split routes, remove unused dependencies, and prefer a two-file build (one pinned library, one application bundle) over many small ones.
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.xfinity.com/akam/13/1050f781 | html | 404 | 1.69 s | 8.0 KB |
| https://www.xfinity.com/national/xfinity-learn-ui/images/favicon/favicon.ico | images | 404 | 1.56 s | 10 B |
| https://www.xfinity.com/national/T353x0FnNc/CaVf/-OMUeF/LaX5NkbfOfXGmXOmLE/JF1pJxAlNAM/RmliC/ikhR24 | other | 404 | 1.56 s | 10 B |
| https://www.xfinity.com/national/xfinity-learn-ui/images/favicon/apple-touch-icon.png | images | 404 | 1.55 s | 10 B |
| https://www.xfinity.com/national/xfinity-learn-ui/images/favicon/favicon-16x16.png | images | 404 | 1.55 s | 10 B |
| https://www.xfinity.com/national/xfinity-learn-ui/images/favicon/favicon-32x32.png | images | 404 | 1.42 s | 10 B |
| https://assets.xfinity.com/assets/dotcom/lzchat/xfinity_lzchat.js 3rd party | javascript | 200 | 1.39 s | 11.4 KB |
| https://www.xfinity.com/national/xfinity-learn-ui/main.2b73c3a92cbf23c9b657.css | css | 200 | 1.34 s | 20 B |
| https://assets.comcast.com/assets/dotcom/projects_3/2026/october/cix-11133_iphone-duo_pre-order/iphone-duo-stack/iPhone-Duo_Small-Banner_Mobile-Image.png 3rd party | images | 200 | 1.33 s | 226.1 KB |
| https://www.xfinity.com/national/xfinity-learn-ui/favicon.ico | images | 200 | 1.31 s | 10.8 KB |
| https://www.xfinity.com/national/xfinity-learn-ui/2726.2b73c3a92cbf23c9b657.css | css | 200 | 1.31 s | 20 B |
| https://static.cimcontent.net/data-layer/?appID=resi_shop_2 3rd party | javascript | 200 | 1.29 s | 26.1 KB |
| https://polaris.xfinity.com/v2/polaris.js 3rd party | javascript | 200 | 1.29 s | 2.3 KB |
| https://assets.comcast.com/assets/dotcom/projects/cix-2602_xpc-re-platform/Spacer.png 3rd party | images | 200 | 1.29 s | 96 B |
| https://www.xfinity.com/national/"https://assets.comcast.com/assets/dotcom/projects_3/2026/september/cix-10962_hsd-offer-refresh-9-9/0909-HSD-Refresh_Hero_Desktop.jpg" | other | 404 | 1.28 s | 10 B |
| https://assets.comcast.com/assets/dotcom/projects_3/2026/jan/new_hovertile-imagery/Entertainment_HoverTile-Overall.png 3rd party | images | 200 | 1.26 s | 173.8 KB |
| https://assets.comcast.com/assets/dotcom/projects_3/2026/june/cix-10716_build-your-plan-hover-tile-update/New_HoverTileCard_Trans.png 3rd party | images | 200 | 1.26 s | 157.7 KB |
| https://assets.comcast.com/assets/dotcom/projects_3/2026/jan/new_hovertile-imagery/Mobile_HoverTile-Overall.png 3rd party | images | 200 | 1.26 s | 85.4 KB |
| https://assets.comcast.com/assets/dotcom/projects_2/cix-6547_large-prices-on-homepage/internet-card-image-dt.png 3rd party | images | 200 | 1.26 s | 16.2 KB |
| https://assets.comcast.com/assets/dotcom/projects_2/cix-6547_large-prices-on-homepage/security-card-image-dt.png 3rd party | images | 200 | 1.26 s | 11.7 KB |
| https://assets.comcast.com/assets/dotcom/projects_3/2026/may/cix-10467_movers_refresh_2-0/movers-page/Icon_Box_Purple.svg 3rd party | images | 200 | 1.26 s | 318 B |
| https://www.xfinity.com/akam/13/pixel_1050f781?a=dD1kYzkxZWU0ZDA4MjQxZDMwYTYxZjZhMTg4NGM2MjdjM2MzZmJjNjcwJmpzPW9mZg== | html | 200 | 1.26 s | 0 B |
| https://www.xfinity.com/national/xfinity-learn-ui/2726.83a8820b43722829d0b7.js | javascript | 200 | 1.26 s | 865.7 KB |
| https://www.xfinity.com/national/xfinity-learn-ui/main.0b754565a3617d10233d.js | javascript | 200 | 1.26 s | 425.8 KB |
| https://www.xfinity.com/national/xfinity-learn-ui/runtime.72dd79305fcd072d9437.js | javascript | 200 | 1.26 s | 3.0 KB |
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