www.nicovideo.jp speed test — 20 Oct 2026
Measured from the wfix.shop server on 20 October 2026 at 13:18 UTC. Grade B (84/100), with the screenshots, the timings and the fixes that matter.
Where the first byte went
- DNS lookup 74 ms 11%
- TCP connect 43 ms 6%
- Server wait 565 ms 83%
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 took 682 ms. Everything else waits for that number, so the server is where to start: caching, a slow query, or an overloaded host.
- The page transfers 568.0 KB over 17 request(s). Javascript files are 88% 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.
- 95% 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 1.38 s, inside the 2.5 s Google calls good.
- The main thread was blocked for 899 ms, so taps and scrolling wait while scripts run.
Fix first: Server response time (TTFB) - Cut server think time: page cache, query indexes, fewer synchronous calls to third parties inside the request. Connection setup is distance, so a nearer region or a CDN edge helps instead.
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. 17 request(s) in total, 568.0 KB across all of them.
Top issues
Server response time (TTFB)
high impactThe first byte arrived after 682 ms. Of that, 565 ms was the server thinking and 117 ms was connection setup. A first byte under 400 ms is what a visitor feels as instant.
Fix: Cut server think time: page cache, query indexes, fewer synchronous calls to third parties inside the request. Connection setup is distance, so a nearer region or a CDN edge helps instead.
Third-party weight
medium impact4 third-party host(s) serve 541.8 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 impact1 JavaScript file(s) over 200 KB: vendor.js (418.0 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.
Mobile viewport
medium impactNo viewport meta tag, so a phone renders the desktop layout scaled down.
Fix: Add a viewport meta tag with width=device-width and an initial scale of 1.
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.nicovideo.jp/{{values.icon.url}} | html | 404 | 964 ms | 2.7 KB |
| https://www.nicovideo.jp/{{values.banner.url}} | html | 404 | 728 ms | 2.7 KB |
| https://www.nicovideo.jp/{{thumbnail}} | html | 404 | 725 ms | 2.7 KB |
| https://resource.video.nimg.jp/web/images/favicon_uni/48.png?re 3rd party | images | 200 | 640 ms | 1.1 KB |
| https://www.googletagmanager.com/ns.html?id=GTM-KTTXCBK 3rd party | html | 200 | 639 ms | 200 B |
| https://resource.video.nimg.jp/web/images/favicon_uni/32.png?re 3rd party | images | 200 | 629 ms | 695 B |
| https://resource.video.nimg.jp/web/scripts/bundle/pages_index_TopPage.js?1792468514 3rd party | javascript | 200 | 623 ms | 23.7 KB |
| https://resource.video.nimg.jp/web/images/favicon_uni/144.png?re 3rd party | images | 200 | 623 ms | 3.3 KB |
| https://res.ads.nicovideo.jp/assets/js/ads2.js?ref=www 3rd party | javascript | 200 | 622 ms | 21.9 KB |
| https://resource.video.nimg.jp/web/images/favicon_uni/96.png?re 3rd party | images | 200 | 622 ms | 2.2 KB |
| https://assets.embed.res.nimg.jp/js/api.js 3rd party | javascript | 200 | 620 ms | 33.6 KB |
| https://resource.video.nimg.jp/web/images/favicon_uni/favicon.ico?re 3rd party | images | 200 | 617 ms | 1.1 KB |
| https://resource.video.nimg.jp/web/scripts/bundle/vendor.js?1792468514 3rd party | javascript | 200 | 614 ms | 418.0 KB |
| https://resource.video.nimg.jp/web/styles/bundle/pages_index_TopPage.css?1792468514 3rd party | css | 200 | 597 ms | 36.0 KB |
| https://www.nicovideo.jp/{{ this }} | other | 0 | 0 ms | 0 B |
| https://www.nicovideo.jp/{{ values.thumbnail.url }} | other | 0 | 0 ms | 0 B |
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