Open Bug 1505192 Opened 6 years ago Updated 2 years ago

twitch.tv site loads slow compared to Chrome

Categories

(Core :: JavaScript Engine, enhancement, P2)

Product:
Core
Component:
JavaScript Engine
Version:
65 Branch
Platform:
Unspecified
Android
Type:
enhancement

Tracking

()

Project Flags:
Performance Impact medium
Tracking Flags:
Tracking Status
firefox65 --- affected

People

(Reporter: vchin, Unassigned)

References

Details

(Keywords: perf:pageload) 

Profile of twitch.tv site on Moto G5 using Geckoview Example App.
https://perfht.ml/2zxgvLN

Compared to Chrome we load about 1-2s slower.
Blocks: 1505256
Focus with GV64 loads 2x slower than Klar with Webview on the Moto G5.

jesup did further investigation and it shows lots of JS
https://perf-html.io/public/235d462f952a24935f2ff2e3a06e12d191e8ad1f/calltree/?globalTrackOrder=0-1&localTrackOrderByPid=9362-1-0~9388-0~&range=0.8386_21.7384&thread=2&v=3
Component: Performance → JavaScript Engine
Whiteboard: [qf:p1:pageload]
OS: Unspecified → Android
Priority: -- → P2

We are still quite a bit behind here:

Fenix:
Load: 2.50s (σ690.00ms), speedIndex: 1.80s (σ210.00ms), visualComplete85: 2.34s
Chrome:
Load: 2.78s (σ146.00ms), speedIndex: 1.24s (σ129.00ms), visualComplete85: 1.32s

The difference is not actually that significant to user experience, so will change this to qf:p2.

Whiteboard: [qf:p1:pageload] → [qf:p2:pageload]
Performance Impact: --- → P2
Keywords: perf:pageload
Whiteboard: [qf:p2:pageload]
Severity: normal → S3
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