1608035 - very slow loading of larger html files with lot of color tags, since version 70 - chrome works as expected

Status: UNCONFIRMED

(Core :: DOM: Core & HTML, defect, P2)

Description

[Uwe Kaufmann]

Attachment: mix.html

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0

Steps to reproduce:

Firefox uzpdated from version 69 tp 70. since this the loading of this kind of html files is very very slow . same file loaded in chrome appears afdter some seconds - which is what i expect . I can send one of my examples for recreate .
If i downgrade to firefox version 69 the speed is ok .

Actual results:

big delays for laoding this kind of files - log file from an applicatiojn which lots of color tags (usually used in eclipse RCP program - but can also load these files as html file seperate)

Expected results:

similar speed as befor on firefox 69

Comment 1

[Pablo]

Hi Uwe

I tried to replicate the issue using windows10 64bit and the latest Firefox Nightly release 74.0a1
and the html file loaded really fast.

Please download the latest Firefox Nightly release from here: https://nightly.mozilla.org/ and retest the problem.

If you still have the issue please create a new profile, you have the steps here:https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles?redirectlocale=en-US&redirectslug=Managing-profiles#w_starting-the-profile-manager

Lastly test if the issue is reproducible in safe mode, here is a link that can help you:
https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode

Regards
Pablo

Comment 2

[Uwe Kaufmann]

Hi Pablo, i have done your recommendations , but still need too much time to load this html example.

Meanwhile i have reinstalled my 69.0.01 firefox version and this is now loading the file immediately.
I can open this file with this version and chrome and get very similar result.
If i use firefox - starting with version 70 ( now i have tried the nightly version) it takes more then 20 seconds to see results on the web.

Do you know any way to trace this action with my old version and with your latest release ?

Thanks and Regards, Uwe

Comment 3

[Uwe Kaufmann]

Attachment: latest firefox loading this file.docx

did some tracing and send screenshot results for latest firefox version and version 69 - loading the same html file

Comment 4

[мэргэн]

плохо