vietjack.com speed test — 20 Oct 2026
Measured from the wfix.shop server on 20 October 2026 at 14:12 UTC. Grade D (68/100), with the screenshots, the timings and the fixes that matter.
Where the first byte went
- DNS lookup 242 ms 20%
- TCP connect 226 ms 19%
- Server wait 714 ms 60%
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 1.18 s. Everything else waits for that number, so the server is where to start: caching, a slow query, or an overloaded host.
- The page transfers 1.17 MB over 26 request(s). Images files are 97% of it, so resize and recompress the largest images before anything else.
- The HTML itself arrives gzip-compressed.
- It runs over HTTP/2, so the assets share a connection instead of opening one each.
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.
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, 1.17 MB across all of them.
Top issues
Server response time (TTFB)
high impactThe first byte arrived after 1182 ms. Of that, 714 ms was the server thinking and 468 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.
Render-blocking resources
high impact12 render-blocking resource(s) in the document head (4 script(s), 8 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
medium impactThe page transfers 1.17 MB across 26 request(s), with the document itself at 30.5 KB.
Fix: Work through the heaviest assets first: images, then fonts, then third-party scripts.
Cache static assets
medium impact24 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.
Strict-Transport-Security
low impactHSTS is not set, so the first visit on a hostile network can still be downgraded to HTTP.
Fix: Send Strict-Transport-Security with a max-age of at least six months. Add includeSubDomains once every subdomain is HTTPS.
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://vietjack.com/git/images/exam.svg | images | 200 | 1.70 s | 17.1 KB |
| https://vietjack.com/git/images/book.svg | images | 200 | 1.69 s | 5.9 KB |
| https://vietjack.com/git/images/icon.png | images | 200 | 1.59 s | 239 B |
| https://vietjack.com/git/images/logo3.png | images | 200 | 1.56 s | 1.4 KB |
| https://vietjack.com/git/images/doc.png | images | 200 | 1.55 s | 2.6 KB |
| https://vietjack.com/git/images/gbt.svg | images | 200 | 1.52 s | 12.8 KB |
| https://vietjack.com/images/loading-cg.gif | images | 200 | 1.50 s | 683 B |
| https://vietjack.com/assets/dmca-badge-w200-5x1-01.png | images | 200 | 1.47 s | 5.0 KB |
| https://vietjack.com/git/images/doc_icon/book_trongtam678.webp | images | 200 | 1.47 s | 140.9 KB |
| https://vietjack.com/git/images/doc_icon/book_trongtam11.webp | images | 200 | 1.47 s | 139.9 KB |
| https://vietjack.com/git/images/doc_icon/giao-an.png | images | 200 | 1.46 s | 21.3 KB |
| https://vietjack.com/git/images/doc_icon/book_dgnl.webp | images | 200 | 1.44 s | 48.7 KB |
| https://vietjack.com/git/images/doc_icon/trac-nghiem.png | images | 200 | 1.44 s | 9.3 KB |
| https://vietjack.com/assets/logo4.png | html | 404 | 1.44 s | 0 B |
| https://vietjack.com/git/images/doc_icon/book_bode.webp | images | 200 | 1.43 s | 126.7 KB |
| https://vietjack.com/git/images/doc_icon/book_sotay.webp | images | 200 | 1.42 s | 187.6 KB |
| https://vietjack.com/git/images/doc_icon/book_btct4.webp | images | 200 | 1.42 s | 165.7 KB |
| https://vietjack.com/git/images/doc_icon/giao-an-word.png | images | 200 | 1.42 s | 10.2 KB |
| https://vietjack.com/git/images/doc_icon/de-thi.png | images | 200 | 1.42 s | 3.6 KB |
| https://vietjack.com/git/images/doc_icon/de-hsg.png | images | 200 | 1.41 s | 9.2 KB |
| https://vietjack.com/git/images/doc_icon/book_tongon.webp | images | 200 | 1.40 s | 158.5 KB |
| https://vietjack.com/git/images/doc_icon/book_captoc789.webp | images | 200 | 1.39 s | 84.6 KB |
| https://vietjack.com/git/images/doc_icon/giao-an-pp.png | images | 200 | 1.38 s | 5.3 KB |
| https://vietjack.com/git/images/qa.png | images | 200 | 1.37 s | 4.0 KB |
| https://vietjack.com/git/images/kh.png | images | 200 | 1.34 s | 2.9 KB |
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