For a long time i used 5.55 gen-d guys and than i upgraded the version of my psp-1000 to 6.35 for playing the god eater burst and some new games...

than i learned that 6.35 is not a permanent cfw so than i downgraded it to 6.20 pro nightly...

So here is the question and problem of mine :

i can't have the same performance with 6.35 or 6.20 with my old 5.55 gen-d such as all of the things going slowly, opening loading ...
So the question is do i screw up with the upgrading-downgrading issue??? so that i have this situations... or is there anyone that realize the same case with their psp..

its important for me to know this cause im trying to make a decision of going back to 5.55 gen-d or something better than 6.20 pronightly...

Thanks...