Incorrect (uncompressed) Transfer Size in Eliminate render-blocking resources

[janmazanek]

FAQ

• Yes, my issue is not about variability or throttling.
• Yes, my issue is not about a specific accessibility audit (file with axe-core instead).
• Yes, my issue is not answered by other FAQs.

URL

https://www.llentab.cz/

What happened?

Report from Sep 17, 2024, 9:09:38 PM https://pagespeed.web.dev/analysis/https-www-llentab-cz/rirg0fktpp?hl=en&form_factor=mobile > Diagnose performance issues >
Eliminate render-blocking resources: reports Transfer size 948.8 KiB for https://www.llentab.cz/wp-content/uploads/fusion-styles/436e7d06a0607291c955106f99a891d8.min.css?ver=3.11.10

But at server log I see, that the resource was compressed and real transfer size was 127854 bytes:

66.102.9.97 - - [17/Sep/2024:21:09:41 +0200] "GET /wp-content/uploads/fusion-styles/436e7d06a0607291c955106f99a891d8.min.css?ver=3.11.10 HTTP/2.0" 200 127854 "https://www.llentab.cz/" "Mozilla/5.0 (Linux; Android 7.0; Moto G (4)) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4590.2 Mobile Safari/537.36 Chrome-Lighthouse" www.llentab.cz:443 [llentab.cz] 47922 205 53240 - "-" "-"

IMHO reports should be fixed to display real transfer size of the resources.

(this bug was originaly reported at https://groups.google.com/g/web-vitals-feedback/c/k6Zmx1V6ofo )

What did you expect?

IMHO reports should be fixed to display real (compressed) transfer size of the resources.

What have you tried?

Took a look in server log.

How were you running Lighthouse?

PageSpeed Insights

Lighthouse Version

12.2.0

Chrome Version

No response

Node Version

No response

OS

No response

Relevant log output

66.102.9.97 - - [17/Sep/2024:21:09:41 +0200] "GET /wp-content/uploads/fusion-styles/436e7d06a0607291c955106f99a891d8.min.css?ver=3.11.10 HTTP/2.0" 200 127854 "https://www.llentab.cz/" "Mozilla/5.0 (Linux; Android 7.0; Moto G (4)) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4590.2 Mobile Safari/537.36 Chrome-Lighthouse" [www.llentab.cz:443](http://www.llentab.cz:443/) [[llentab.cz](http://llentab.cz/)] 47922 205 53240 - "-" "-"

[connorjclark]

Thanks for the bug report! We confirmed it on our end.

---

LR is passing along the expected headers, so something LH-side is messed up.

[connorjclark]

broke b/c of https://github.com/GoogleChrome/lighthouse/pull/15839/files#diff-48acddc551aad7d9c4112e6f668ec10acca92f8b82f39f71d2b19b6a18e6e855L178

[connorjclark]

This should be fixed in PSI perhaps sometime Friday.

[janmazanek]

This should be fixed in PSI perhaps sometime Friday.

Thank you for very fast fix.