[webkit-changes] [WebKit/WebKit] a76856: Prewarm Web process when load starts

[Per Arne Vollan]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: a7685646bededd26e4b2a8a0b69e0b7c05cbede8
      https://github.com/WebKit/WebKit/commit/a7685646bededd26e4b2a8a0b69e0b7c05cbede8
  Author: Per Arne Vollan <pvollan at apple.com>
  Date:   2023-07-24 (Mon, 24 Jul 2023)

  Changed paths:
    M Source/WebKit/UIProcess/WebPageProxy.cpp
    M Source/WebKit/UIProcess/WebProcessPool.h

  Log Message:
  -----------
  Prewarm Web process when load starts
https://bugs.webkit.org/show_bug.cgi?id=259447
rdar://112777207

Reviewed by Brent Fulgham.

We currently prewarm a Web process when the main frame load has finished. Instead, prewarm a Web process
when the provisional load starts, which has been measured to be a 1-2% speedup in page load time.

* Source/WebKit/UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::notifyProcessPoolToPrewarm):
(WebKit::WebPageProxy::didStartProvisionalLoadForFrameShared):
(WebKit::WebPageProxy::didFinishLoadForFrame):
* Source/WebKit/UIProcess/WebProcessPool.h:

Canonical link: https://commits.webkit.org/266255@main