Johan Vromans writes: > However, when a mail folder gets big (more than 2000 messages or so) > VM really slows down. With big IMAP folders it becomes painfully slow > when saving (due to the local cache of 100+Mb) and autosave (or poll?) > makes Emacs unresponsive for several seconds every couple of minutes.
I don't think the number of messages matters much, but the total size of the folder make a difference because the entire folder is stored in the main memory. You can cut down the size of the folder by using "external messages" (Section 1.4 of the VM Manual). I let my folders go up to 5000-6000 messages without any problem. The autosave behaviour may vary between different Emacs versions. On Emacs 24.2, I don't get any pauses at all. My settings are: (setq large-file-warning-threshold 100000000) (setq auto-save-timeout 900) ; default is 30 (setq auto-save-interval 1000) ; up from the default of 300 Cheers, Uday