1227773 - Pages are loading unusually slowly on latest DevEd44

Status: NEW

(Core :: General, defect)

Description

[Ritu Kothari (:ritu) (Inactive, please n-i to RyanVM, jcristau, or pascal)]

Firefox version: 44.0a2 BuildId: 20151123004034

STR:
1. Open FF44.0a2.
2. Open a bunch of tabs like gmail, facebook, linkedin, cnn, google shopping express.
3. Wait for all pages to load up. 10-20 seconds before the browser seems loaded and ready.
4. Alt-F -> exit, restart FF44.0a2
5. Notice ~20 seconds before all the pages load up, are ready and responsive.

Expected: It should take a few seconds to load these pages.

Actual: It takes anywhere from 15-20 seconds before I would consider the browser done loading all the pages after step 4. 

Do we have some benchmarking on page-load times? If so, would it be possible to do comparison build over build or week over week?

Comment 1

[Boris Zbarsky [:bzbarsky]]

Does it take a long time for the pages to _start_ loading (be restored from session restore) or to finish loading once they start?

Out of curiosity, how long does it take if you disable e10s?

Comment 2

[Ritu Kothari (:ritu) (Inactive, please n-i to RyanVM, jcristau, or pascal)]

(In reply to Boris Zbarsky [:bz] from comment #1)
> Does it take a long time for the pages to _start_ loading (be restored from
> session restore) or to finish loading once they start?

It takes much longer to finish loading on a session restore than the time to finish loading on a new session.

> 
> Out of curiosity, how long does it take if you disable e10s?

At first I observed the slowness (after updating my 44.0a2 this afternoon) with e10s enabled. So I decided to disable e10s and did not "notice" a difference.