com.apple.appkit.xpc.openAndSavePanelService.xpc (Crashes!!!)

Thanks HaloJax, I had the issue of

com.apple.appkit.xpc.openAndSavePanelService.xpc taking up 70% of my CPU and, weirdly something else at 45% - (clearly more than 100%) anyway, concerned, I looked and found your reply. I quit a few applications and it cleared. Will now restart too as it's been a week - thanks for the reminder.

For some reason I experienced the same issue today with Preview.

Activity Monitor shows com.apple.appkit.xpc.openAndSavePanelService.xpc becoming non-responsive.

I looked at Console.app (/var/log/system.log), and this keep crashing

/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/CVMCompiler

I switched from Nvidia Web drivers to OS X Default and the issue is now gone.

I do not know if in your case this is related to the same root cause but either way you should have a look at the logs, or Console.app to see what happens there.

I'm just going to let the Norton File Guard log speak for itself, this is last weeks history of blocked events (at least those of which when I had Norton File Guard enabled):

These came in at times when I WAS NOT accessing these files,

Am I paranoid or being personally targeted (vs. the run of the mill virus mahhem)?

Path location:

/System/Library/Frameworks/AppKit.framework/Versions/C/XPCServices/

Same here:

I think I found the answer. I had two instances of the process com.apple.appkit.xpc.openAndSavePanelService running both using between 70-99% of the CPU. I starting quitting apps one at a time to see if the process would quit with one of them. Sure enough quitting Numbers cancelled one and quitting Pages cancelled the other. Launching both pages and Numbers started the processes again. But now at 2-4% of the CPU. I did have about 10 spreadsheets open for a few days without restarting. Maybe a simple restart now and then would be a good idea.