Gmail ‘Refresh POP3 accounts’

Have you used Gmail's POP3 fetching feature to read messages from other email accounts, you may have noticed that Gmail checks for new messages less frequently than desktop mail clients. Google added a new Gmail Labs feature that lets you manually refresh your accounts “Turn on "Refresh POP accounts" from the Labs tab under Settings, and the refresh link at the top of your inbox will not only update your inbox with your new Gmail messages, it will also fetch messages from any other accounts which you have set up,” explains Google.

[Source]