1668214 - High CPU usage while loading pdf through slow connection / HTTP server (1% CPU in Chrome)

Status: RESOLVED INCOMPLETE

(Firefox :: PDF Viewer, defect, P3)

Description

[Enrique]

User Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0

Steps to reproduce:

Open next pdf document:
https://www.nbc.org.kh/download_files/research_papers/khmer/NBC_BAKONG_White_Paper.pdf

Actual results:

It takes about 1 minute to download. In the mean time Firefox wastes lot of CPU.

Looks like some (non-need) processing is being done.

Expected results:

Do not waste "tons" of CPU while just waiting for remote PDF data.

Comment 1

[Calixte Denizet (:calixte)]

:Enrique, could you get and share a profile (https://profiler.firefox.com/docs/#/) ?
I just did it myself on a windows 11 machine and as far as I can tell I don't see anything wrong.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

Redirect a needinfo that is pending on an inactive user to the triage owner.
:calixte, since the bug has recent activity, could you please find another way to get the information or close the bug as INCOMPLETE if it is not actionable?

For more information, please visit auto_nag documentation.

Comment 3

[Calixte Denizet (:calixte)]

I'm closing as INCOMPLETE, don't hesitate to reopen if there are more information.