Anyone else having absolutely painful IMAP experience? It seems that it might be GMail but this is unusable. I'm thinking of going back to POP. So slowwwwwwwww.....
I was having issues when the IMAP was just launched. Some of the issues are due to incorrect config of the folders in Mail.app, meaning that it will be doing of unnecessary things if it's incorrectly configured. back then Gmail hadn't put the recommened settings for Mail.app on their website... After checking that config, everything seems to work smoother.
IMAP Gmail on my iPhone is actually faster than on Apple Mail. I just did a test and it took 16 seconds on Apple Mail and just 5 seconds on my iPhone Mail to receive the same email!