As reported in bug 182227, we need to do something about the way mailnews copies a mail message (for example, when it copies it to the Sent folder). Here's what its doing. We read 10k bytes into a buffer, return just the first line, seek to the end of the first line, then read 10k bytes again, return the second line, seek to the end of the second line, etc. Talk about slow. No wonder I'm seeing reports of disk grinding noises. I don't think you could come up with a slower way to copy a file if you tried!!!

*** Bug 182227 has been marked as a duplicate of this bug. ***

Reporter, is this on an IMAP account?

Nope, POP3.

taking.

this will speed up copying quite a bit, and fix the disk grinding. It doesn't have to do with your diagnosis of the problem, Colin, but it gives a huge perf win so I'm attaching it to this bug.

Comment on attachment 121081 [details] [diff] [review] partial fix this has r/sr=sspitzer

marking fixed