Summary: Background tabs are often updating non-stop because they think they are visible I frequently see Infinite assertions coming from the Network tab, which I never opened, because it is trying to update its graphs with NaN numbers. Likewise if I profile Web Inspector I sometimes see the Timeline tab doing Infinite updates despite the fact that it is not visible. This is a quick fix for the issue but linking to the bigger fix that should address this.
<rdar://problem/29298658>
Created attachment 294990 [details] [PATCH] Proposed Fix
The long-term fix is here: https://bugs.webkit.org/show_bug.cgi?id=153634
Comment on attachment 294990 [details] [PATCH] Proposed Fix Clearing flags on attachment: 294990 Committed r208832: <http://trac.webkit.org/changeset/208832>
All reviewed patches have been landed. Closing bug.