Is Google Apps for Business any faster than the free version?

My Gmail account is getting pretty full - around 78%. I could either delete some old messages and large attachments, or upgrade to the $50/year version. It's also getting really slow - both to load, and to search messages. I'd be more inclined to pay the $50/year if it made it faster, too - but I didn't see this mentioned on the comparison page and didn't have much luck finding the answer with google. Thanks!