CPU spike from nsurlstoraged and Safari Networking

Originator:joachimb
Number:rdar://22267191 Date Originated:13-Aug-2015 03:09 PM
Status:Open Resolved:
Product:OS X Product Version:10.11 Beta (15A244d)
Classification:Performance Reproducible:Sometimes
 
Summary:
Randomly during the day, when using Safari, nsurlstoraged and Safari Networking will start contending for 100% usage of my CPU, which makes my computer so slow that even the mouse cursor becomes stuttery or even unresponsive. Quitting Safari, force-quitting the two offending daemons, or rebooting the computer will temporarily stop the issue from happening (CPU goes down to ~10% and I can use mouse and computer again), confirming that this is a Safari/network stack issue.

I have 3 sticky tabs and ~100 normal tabs across a few spaces and tons minimized.

Will amend with samples of daemons if I manage to get that much control over my computer next time it happens.

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