I have recently tried out 5.2 on a slightly dated hardware (nvidia based, Athlon, 500MB Ram). Working with Seamonkey or Xombrero seems to be slow, pages load reluctantly in 5.2. Videos on Youtube are almost impossible to view. I tried changing settings in pf, cache, network cards etc but had to go back to 5.1. It seems there is some I/O problem with 5.2.
Regards / J