1443776 - Long startup time on 11.0 (9379)

Status: RESOLVED FIXED

(Firefox for iOS :: General, defect)

Description

[Simon Basca [:SimonB]]

Build: 11.0(9379)
Device: iPhone SE
iOS: 11.0.1

Steps to reproduce: 
1. Open "https://www.loadview-testing.com/" in 20 tabs
2. Close Firefox from app switcher
3. Open Firefox

Actual results:
- The startup time is long regardless if Tracking Protection is On or Off. Below you can find some measurements of the startup time after step 3): 

- iPhone SE (11.0.1) Firefox 11.0(9379). Video -> https://www.youtube.com/watch?v=_V64gJsa2Ps

T1 = 11.18 seconds
T2 = 8.65 seconds
T3 = 10.93 seconds


- iPhone SE (11.0.1) on Firefox 10.6 (8836):

T1 = 3.3
T2 = 3.94
T3 = 3.41

- iPhone SE (10.3.3) Firefox 11.0(9379):

T1 = 6.30 seconds
T2 = 5.39 seconds
T3 = 6.24 seconds

Comment 1

[Simon Basca [:SimonB]]

Note: 

- iPhone SE (11.0.1) Firefox 11.0(9379) with one opened tab on "https://www.loadview-testing.com/" the startup time is ~ 4.3 seconds. 

- Checking/Unchecking "Send Usage Data" doesn't change the startup time on iPhone SE (11.0.1) on Firefox 11.0(9379) with 20 tabs opened.

Comment 2

[Farhan Patel [:farhan]]

Tracking Protection is initialized regardless of the user's pref.

Comment 3

[:garvan]

TP init is running more than once, this PR has a fix for that:
https://github.com/mozilla-mobile/firefox-ios/pull/3692

There is also a perf bug with TP Stats init code I'll get filed and link here.

Comment 4

[:garvan]

Added this as a blocker: https://bugzilla.mozilla.org/show_bug.cgi?id=1444109
Parsing the list for TP Stats.

Comment 5

[Justin D'Arcangelo [:justindarc]]

Clearing NI? since :garvan has already identified the issue.

Comment 6

[:garvan]

Need to make sure bugs get uplifted to 11.0 for this, then mark fixed.