PPTP connecton wont pass much data

I set up a PPTP connection between a MT router and a linux box and it works OK, but the minute I try to access larger amounts of data, it pukes and stops transmitting. Small stuff link pings and ssh work fine.. but Im trying to access a web management page for a wireless AP and it barely loads any of the page before stopping.. Any ideas? everything looks good and there is no real logs to go by.

MTU-Problem? Could be tested by increasing ping packet size with don’t fragment-bit (DF) set.