645,Center_Potion,Concentration Potion,2,800,,100,,,,,0xFFFFFFFF,7,2,,,,,,{ sc_start SC_ASPDPOTION0,1800000,0; },{},{}
656,Awakening_Potion,Awakening Potion,2,1500,,150,,,,,0xFFF7FEEF,7,2,,,40,,,{ sc_start SC_ASPDPOTION1,1800000,0; },{},{}
657,Berserk_Potion,Berserk Potion,2,3000,,200,,,,,0x01E646A6,7,2,,,85,,,{ sc_start SC_ASPDPOTION2,1800000,0; },{},{}
//ASPD in RE they give a fixed +4/+6/+9 ASPD
645,Center_Potion,Concentration Potion,2,800,,100,,,,,0xFFFFFFFF,7,2,,,,,,{ sc_start SC_ASPDPOTION0,1800000,4; },{},{}
656,Awakening_Potion,Awakening Potion,2,1500,,150,,,,,0xFFF7FEEF,7,2,,,40,,,{ sc_start SC_ASPDPOTION1,1800000,6; },{},{}
657,Berserk_Potion,Berserk Potion,2,3000,,200,,,,,0x01E646A6,7,2,,,85,,,{ sc_start SC_ASPDPOTION2,1800000,9; },{},{}
In pre-renewal, POTION0 gives +10% ASPD (i.e. -10% delay between attacks), POTION1 gives +15% ASPD and POTION2 gives +20% ASPD.
In renewal it gives as much ASPD as specified in the parameter between the duration. If you use a renewal compile and the potions don't add any ASPD, it could be that you are using a pre-renewal item db.