Ever since upgrading to El Capitan, whenever Mail is open my computer slows to a crawl and I get the spinning beachball of death. What's the deal here?
-John
MacBook Pro, OS X El Capitan (10.11)
This worked for me ... just deleted these log files & problem solved !
Reply Helpfulby miguel.apple on Oct 7, 2015 2:25 AM
I find that the new Mail app in El Capitan is trying to clean up the log files by zipping them in memory which caused the problem.
Try to delete your log file manually in the following folder (Command + Shift + G):
~/Library/Containers/com.apple.mail/Data/Library/Logs/Mail/
You may see huge size log files in the folder ...just delete all *.log and restart your Mail App. Then, things should back to normal.
Turning off Mail's communication with iCloud Drive seems to have fixed the problem for me:
Preferences -> iCloud -> iCloud Drive -> "Options" -> scroll down to Mail.app and turn it off.
El Capitan Bug: When Mail is open my computer slows or freezes
