Originally posted by Sarada
Could be 2 things, either your ps3 is overheating or you're running out of free space. (Deleting messages and unnecessary stuff helps)
Im sure if they post here they have looked at that already. for a quick fix start ps3 in system recovery and rebuild the database. if its still slow, take out the hdd and format it on pc to fat 32 then re-insert the hdd and install the CFW, if it still lags then you will need to replace your hdd. hope ive helped