On my GUIminer its says I'm mining at 76.4 Mhash/s and it maintains that but sometimes goes ranges from 71.4- 76 but usually its maintains at 76.4 Mhash/s. When I check my account and go to the workers section its says that I'm mining at 47.306 Mhash/s. Is there something wrong with my setup? or is that how it is normally?
try different pool maybe one that is closer to you geographically
OR wait and give it more time to average out , usually they end up being thesame after 1-2 days