Official Gmail Blog: Gmail for mobile: faster, smoother, and now in more languages
Google has now launched Gmail for mobile 2.0 which will not only perform better when a good network is present but also when there is a bad one.
If you haven't tried it till now then try it but how?
Go to m.google.com/mail in your mobile web browser download gmail for mobile 2.0 and let Google know how it worked for you here