Hourglass icon slowly down page loading

Stuck with this hourglass logo on tabs since the latest update v121.0

https://imgur.com/a/k26XOm7

Now what I have noted is that this is causing the pages to load slow. Only ublock extension is installed, tried all dns settings but the result is the same. Is anyone facing the same?

These pages say to change the value and this hourglass thing will be removed

https://support.mozilla.org/en-US/questions/1303416

https://www.reddit.com/r/firefox/comments/igx73s/this_hourglass_icon_on_loading_tabs_in_v80_is/

But I cannot see any option to change the value on that location

https://imgur.com/a/zMRQvka

What to do now?