www.scielo.br speed test — 20 Oct 2026

Measured from the wfix.shop server on 20 October 2026 at 14:23 UTC. Grade A (97/100), with the screenshots, the timings and the fixes that matter.

https://www.scielo.br/

20 October 2026 at 14:23 UTC · Free test · report pt_840ac9569178
Grade
A
97/100
Performance99/100
Structure94/100

14 audit(s) passed, 2 need work

First byte (TTFB)254 msmeasured from this server
Fully loaded1.28 sfirst byte + slowest asset
Requests26document + assets
Page weight11.9 KBcompressed transfer
HTML document11.9 KBbr
ProtocolHTTP/3BunnyCDN-IL1-1235

Where the first byte went

  • DNS lookup 52 ms 20%
  • TCP connect 46 ms 18%
  • Server wait 155 ms 61%

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

First bytefaster than 84% of 4,999 pages tested here254 ms against a median of 449 ms
Page weightlighter than 95% of 4,999 pages tested here11.9 KB against a median of 650.5 KB
Fully loadedfaster than 84% of 4,999 pages tested here1.28 s against a median of 1.84 s
Requestssends more requests than 100% of 4,999 pages tested here26 against a median of 26

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 254 ms. That is workable, and the cheapest win left is caching or a warmer connection.
  • The page transfers 11.9 KB over 26 request(s).
  • The HTML itself arrives br-compressed.
  • It runs over HTTP/3, so the assets share a connection instead of opening one each.
  • The largest element painted at 824 ms, 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 108 ms in total, which is not enough to feel.

Fix first: Render-blocking resources - 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.

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.

Mobile screenshot of www.scielo.br
Mobile 390 × 844 · 32.4 KB · page is 2632 px tall

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.

Largest contentful paint824 msgood is under 2.5 s
Cumulative layout shift0.001under 0.1 is stable
Total blocking time108 mslong tasks during load
First contentful paint824 msfirst content on screen
Browser page weight1.82 MB52 request(s), scripts included
Failed requests1blocked or unreachable
Largest contentful paint824 ms
Goodgood under 2.5 s, poor over 4 s
Cumulative layout shift0.001
Goodgood under 0.1, poor over 0.25
Total blocking time108 ms
Goodgood under 200 ms, poor over 600 ms

Page weight by type

What the page is made of

Transfer size, compressed as sent. 26 request(s) in total, 11.9 KB across all of them.

Top issues

Render-blocking resources

high impact

3 render-blocking resource(s) in the document head (2 script(s), 1 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.

Avoid extra redirects

medium impact

1 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

HTMLblog.scielo.org/en/wp-content/uploads/sites/2/2026/08/…
1.03 s
HTMLpressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/03/…
1.01 s
HTMLpressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/04/…
1.00 s
HTMLblog.scielo.org/en/wp-content/uploads/sites/2/2026/06/…
998 ms
HTMLpressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/05/…
996 ms
HTMLpressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/01/…
995 ms
HTMLpressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/05/…
992 ms
HTMLpressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/02/…
990 ms
HTMLpressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/05/…
988 ms
HTMLpressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/04/…
982 ms

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

RequestTypeStatusTimeSize
https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/08/susan-q-yin-2JIvboGLeho-unsplash-300x200.jpg 3rd partyhtml4031.03 s0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/03/Imagem-UFC-300x225.jpg 3rd partyhtml4031.01 s0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/04/Imagem-bio-300x200.jpg 3rd partyhtml4031.00 s0 B
https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/06/nik-radzi-1aL6yw1NYbg-unsplash-300x200.jpg 3rd partyhtml403998 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/05/imagem-1-300x227.png 3rd partyhtml403996 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/01/Imagem-macroprolactinemia-1-300x281.jpg 3rd partyhtml403995 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/05/imagem-1-1-300x200.png 3rd partyhtml403992 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/02/Imagem-Micro-300x225.jpg 3rd partyhtml403990 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/05/Imagem-dados-300x300.jpg 3rd partyhtml403988 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/04/Imagem1-300x168.jpg 3rd partyhtml403982 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/05/Imagem-cientifica-138x300.jpg 3rd partyhtml403981 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/06/imagem-prin-300x218.png 3rd partyhtml403974 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/05/Imagem1-300x169.jpg 3rd partyhtml403970 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/08/imagem-1-1-300x225.jpg 3rd partyhtml403962 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/05/imagem-12-300x199.png 3rd partyhtml403960 ms0 B
https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/03/photo-1535391909-6b4eeb19f8bb-214x300.jpg 3rd partyhtml403957 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/07/Imagem1-300x169.jpg 3rd partyhtml403956 ms0 B
https://pressreleases.scielo.org/en/wp-content/uploads/sites/2/2026/07/imagem-1-300x167.jpg 3rd partyhtml403955 ms0 B
https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/04/Imagem1-300x169.png 3rd partyhtml403955 ms0 B
https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/04/andrea-de-santis-zwd435-ewb4-unsplash-240x300.jpg 3rd partyhtml403955 ms0 B
https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/04/photo-1504701954957-2010ec3bcec1-300x225.jpg 3rd partyhtml403955 ms0 B
https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/07/nathan-dumlao-qmxzyEJ1PSQ-unsplash-212x300.jpg 3rd partyhtml403954 ms0 B
https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/07/Six-levers-to-support-preprint-sharing_external-share-1-300x169.png 3rd partyhtml403954 ms0 B
https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/05/logo-brcris-300x180.png 3rd partyhtml403954 ms0 B
https://blog.scielo.org/en/wp-content/uploads/sites/2/2026/05/jj-ying-WmnsGyaFnCQ-unsplash-300x200.jpg 3rd partyhtml403954 ms0 B
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