1613227 - [meta] Reduce overhead of creating a new window on GeckoView

Status: NEW

(GeckoView :: General, defect, P3)

Description

[Markus Stange [:mstange]]

Here's a profile of loading google.com in a new tab in Fenix: https://perfht.ml/2OrKjSi

You can see a lot of activity in the parent process when the new tab is created. Accounting for profiling overhead, I'd estimate that creating a new geckoview.xhtml for each tab adds 200ms to 400ms to the first page load of a new tab.

In Firefox Desktop, all tabs in a browser window are managed by the same browser.xhtml.

Comment 1

[[ex-Mozilla] Agi Sferro | :agi]

Having 1 tab = 1 window is pretty central in GeckoView's design, so it's not something we can easily change. We can use this bug to reduce the overhead of creating a new window.

Comment 2

[Brendan Dahl [:bdahl]]

Not loading all the desktop custom elements should help (bug 1531455). Looks like we spend 200ms in that file and then trigger a bunch of notifications related to it.

Comment 3

[Alex Thayer [:alexical] (she/her)]

Removing qf:p1 as meta bugs shouldn't have qf tags.

Comment 4

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

The bug assignee is inactive on Bugzilla, so the assignee is being reset.