Safari hangs momentarily when opening new tabs; "IMK Stall detected" in Console (rdar://problem/16792073)

Originator:specmode
Number:rdar://20663175 Date Originated:4/22/15
Status:Open Resolved:
Product:Safari Product Version:8.0.5 (10600.5.17)
Classification:Performance Reproducible:Sometimes
 
Summary:
When using Safari on OS X 10.10.3 (14D136), I have started experiencing periodic hangs of 1-4 seconds when attempting to open new tabs. Log entries similar to the following are generated in Console corresponding to periods when these hangs occur:

PressAndHold[17381]: IMK Stall detected, *please Report* your user scenario in <rdar://problem/16792073> - (activateServer) block performed very slowly (3.64 secs)

Steps to Reproduce:
1.  Open Safari.
2.  Attempt to open a new tab.

Expected Results:
New tab opens immediately.

Actual Results:
Safari hangs for about 1-4 seconds before opening the new tab (or multiple new tabs, if Cmd-T was pressed multiple times while the app was hung).

Version:
Safari 8.0.5 (10600.5.17)

Comments


Please note: Reports posted here will not necessarily be seen by Apple. All problems should be submitted at bugreport.apple.com before they are posted here. Please only post information for Radars that you have filed yourself, and please do not include Apple confidential information in your posts. Thank you!