1807313 - Performance experiment: create the speculative gecko session sooner to improve applink (view) startup

Status: NEW

(Fenix :: Performance, defect)

Description

[Chris Peterson [:cpeterson]]

From github: https://github.com/mozilla-mobile/fenix/issues/15973.

The idea behind the experiment:
Create the gecko engine session as soon as possible in order to improve applink (view) startup time.

Since the view test (measuring navigation start and loadEvent) depends on the gecko engine and the content process if we can instantiate the gecko engine sooner, we may be able to improve our timings.

Procedure

Create a speculative gecko engine session in FenixApplication OnCreate()

components.core.engine.speculativeCreateSession(false)

https://github.com/mozilla-mobile/fenix/blob/0e2657e2620457c502e6b79b40f67ced6f8f0117/app/src/main/java/org/mozilla/fenix/FenixApplication.kt#L120

Results

No measured difference:

Variant	Median, navStart	Median, loadEventEnd
Baseline	2420	5496
Experiment	2420	5526

Baseline:
https://docs.google.com/spreadsheets/d/1lu_c0hZGMzMpqGuEb8wtA8hwEucItiy-Uf8gpWUYVmo/edit#gid=0&range=B1:G22

Experiment:
https://docs.google.com/spreadsheets/d/1lu_c0hZGMzMpqGuEb8wtA8hwEucItiy-Uf8gpWUYVmo/edit#gid=0&range=B24:G45

┆Issue is synchronized with this Jira Task

Change performed by the Move to Bugzilla add-on.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:cpeterson, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 2

[Marc Leclair [:mleclair]]

The Performance Impact Calculator has determined this bug's performance impact to be low. If you'd like to request re-triage, you can reset the Performance Impact flag to "?" or needinfo the triage sheriff.

Platforms: Android
Impact on browser: Causes noticeable jank
Websites affected: Rare

Comment 3

[Marc Leclair [:mleclair]]

duplicate comment