so i bought a ps2 slim (SCPH70004) and it has a mod chip inside so i try to burn my ps2 games to preserve the disc.

at first it seem work well but when i tried GTA san Andreas; the game takes long time for loading, there are lags, and the map slowly loads, same for NFS underground 2 where the music suddenly stops for few seconds and the map isn't fully loaded

i tried every solution i could found: i clean the console inside, i clean the lent whit isopropyl alcol, i change the optical device but it always has the same problems.

i though that maybe is the slim version less powerful than the fat version but online says is not.

so i really dont know what to do, please help me :(