[Webkit-unassigned] [Bug 162865] Background tabs should suspend or unload on macOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=162865

--- Comment #5 from Craig Hockenberry <craig.hockenberry at gmail.com> ---
Now that you've armed me with a small bit of knowledge, I'm experimenting with Safari and the Activity Monitor :-)

When I load this page in Safari 10 (running on latest public Sierra), I see about 12-13% CPU usage:

https://stripe.com/docs

If I create another tab, and make it frontmost, the CPU usage drops down to well under 1% as expected. If I move the window to another space, I also see CPU usage go down. Awesome!

However, if I create another window and make it frontmost in the same space, the CPU usage for the previously opened window/tab doesn't go down.

Maybe the throttling needs to be applied to the frontmost tab of an inactive window, too. Personally, I tend to collect "ideas" in separate windows with multiple tabs. The Stripe site is me thinking about adding ApplePay to one of our commerce sites - it's the frontmost tab in the window because it's the last thing I looked at. The problem is that I have eight other windows in that space: only the frontmost one is collecting my current work.

The Stripe tab is churning away with no benefit to me, it's hidden by a bunch of other windows, and I'm still using Activity Monitor to find battery killers.

I hope this info is useful - I'm really glad you folks are thinking about this issue!

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