If you use Gmail's previously mentioned Mail Fetcher tool to grab email from other POP3-enabled email accounts, you may have noticed that it sometimes checks for new mail on very slow intervals—particularly if you're importing from a mostly inactive account.
The solution, then? Your account needs to get more email. Naturally, though, you don't want to flood your Gmail inbox with new email just so you can be sure your POP account is checking at more reasonable intervals.
This Extension will automate fetch email from 3rd party server to your Gmail every minute. No need to do anything else.