1248357 - FF NOT RESPONDING & DEAD SLOW when logged into Youtube with 344 subscriptions

Status: RESOLVED DUPLICATE of bug 1220502

(Firefox :: Untriaged, defect)

Description

[rororo74]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:44.0) Gecko/20100101 Firefox/44.0
Build ID: 20160210153822

Steps to reproduce:

1. Install a fresh Mozilla Firefox on a brand new computer.
2. log into your youtube account with 344 subscriptions
3. watch FF buckle under the unbearable weight and crumble to its knees with the hourglass going round and round, its top-bar saying 'not responding' and a red-progress bar stuck half way across the very top of the browsing area.
4. tie a brick round your neck and jump out the window from despair or change browser.
I chose to go over to Chrome which was lightning fast compared to FF.
This issue became obvious after September-October 2015.


Actual results:

FF buckles under the unbearable weight and crumble to its knees with the hourglass going round and round, its top-bar saying 'not responding' and a red-progress bar stuck half way across the very top of the browsing area.
Eventually it does what it is supposed to do but everything is suicide slow.


Expected results:

FF should perform as fast when logged into my YT account with 344 subscriptions as when I am NOT logged into my YT account.

Comment 1

[rororo74]

I switched to Chrome which is SUPER fast when performing the tasks mentioned in this bug report.
In the meantime because I love FF for all the other goodies it has, I looked for a solution.
I found it today and I am writing to you because I WANT YOU TO FIX FF!!!
The solution was found here:
https://productforums.google.com/forum/#!topic/youtube/0VGG4hSfI8U
Firefox freezes when playing YouTube videos while logged into my account.

I did exactly what Jamie Lang said: 
"If you want to get rid of the lag while they look into it, try installing the addon Stylish, which allows custom CSS and use this rule to hide the list:

@-moz-document domain("youtube.com") {
 #guide-channels{
   display:none !important;
 }
}
"

Jamie's bug report is marked 'resolved' when it clearly is NOT resolved since I have been suffering from it until 15 minutes ago!

So please, fix this terrible bug/lag. 
We depend on FF on a daily basis. 
We do not want to start using other browsers. FF is the best.

Comment 2

[YF (Yang)]

Can you try the Nightly (https://nightly.mozilla.org/)? because you mentioned bug is fixed in Firefox 47. Maybe it will be uplifted to a more recent versions.

Comment 3

[Caspy7]

If it helps you feel any better, it seems likely the fix for this will be released with Firefox 45.

In the mean time, as Yang said, you may use Nightly or stick with your stylish workaround.

It is on Mozilla's radar and a fix is coming to users.