www.semanticscholar.org speed test — 20 Oct 2026
Measured from the wfix.shop server on 20 October 2026 at 13:09 UTC. Grade B (81/100), with the screenshots, the timings and the fixes that matter.
Where the first byte went
- DNS lookup 105 ms 28%
- TCP connect 59 ms 16%
- Server wait 208 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 372 ms. That is workable, and the cheapest win left is caching or a warmer connection.
- The page transfers 1.88 MB over 16 request(s). Javascript files are 89% 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/2, so the assets share a connection instead of opening one each.
- 96% 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 676 ms, inside the 2.5 s Google calls good.
- The main thread was blocked for 508 ms, so taps and scrolling wait while scripts run.
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.
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. 16 request(s) in total, 1.88 MB across all of them.
Top issues
Compress text responses
high impact1 text response(s) of 10 KB or more are sent uncompressed, and the document itself is not compressed. That is 670.9 KB 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.
Total page weight
high impactThe page transfers 1.88 MB across 16 request(s), with the document itself at 86.2 KB.
Fix: Work through the heaviest assets first: images, then fonts, then third-party scripts.
Third-party weight
medium impact7 third-party host(s) serve 1.80 MB 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: challenge.js (670.9 KB), BrowserEntry.tsx.js (713.2 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://c09bc9c04079.edge.sdk.awswaf.com/c09bc9c04079/4996efde3854/challenge.js 3rd party | javascript | 200 | 818 ms | 670.9 KB |
| https://cmp.osano.com/AzqB4OUPPVD5j8EeT/a2f76cbd-c5a4-40eb-9bce-16e6237f6265/osano.js 3rd party | javascript | 200 | 770 ms | 74.8 KB |
| https://www.googletagmanager.com/ns.html?id=GTM-592W6WL 3rd party | html | 200 | 762 ms | 92 B |
| https://www.googletagmanager.com/gtag/js?id=G-H7P4ZT52H5 3rd party | javascript | 200 | 698 ms | 194.5 KB |
| https://fonts.googleapis.com/css?family=Roboto+Slab:400,500,600,700|Roboto:300,400,500,600,700&display=swap 3rd party | css | 200 | 693 ms | 347 B |
| https://fast.appcues.com/87350.js 3rd party | javascript | 200 | 689 ms | 5.8 KB |
| https://cdn.semanticscholar.org/96374d262d7c8584/js/BrowserEntry.tsx.js 3rd party | javascript | 200 | 685 ms | 713.2 KB |
| https://js.hs-scripts.com/5910970.js 3rd party | javascript | 200 | 684 ms | 690 B |
| https://cdn.semanticscholar.org/96374d262d7c8584/img/favicon-128.png 3rd party | images | 200 | 672 ms | 6.1 KB |
| https://cdn.semanticscholar.org/96374d262d7c8584/js/bundle-2571.js 3rd party | javascript | 200 | 661 ms | 64.2 KB |
| https://cdn.semanticscholar.org/96374d262d7c8584/css/main.css 3rd party | css | 200 | 653 ms | 80.9 KB |
| https://cdn.semanticscholar.org/96374d262d7c8584/img/favicon-32x32.png 3rd party | images | 200 | 644 ms | 1.1 KB |
| https://cdn.semanticscholar.org/96374d262d7c8584/img/favicon-96x96.png 3rd party | images | 200 | 643 ms | 6.1 KB |
| https://cdn.semanticscholar.org/96374d262d7c8584/img/favicon-16x16.png 3rd party | images | 200 | 637 ms | 511 B |
| https://cdn.semanticscholar.org/96374d262d7c8584/img/favicon-196x196.png 3rd party | images | 200 | 632 ms | 22.5 KB |
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