this is why i've always had a smooth experience in APB, overclock the shit out of my CPU regardless of requirement, last build was a Intel Core i5 4690K Processor (3.5 GHz, 6 MB Cache, LGA1150 Socket) which i have overclocked to 4.5ghz (a quick google shows i could get it to 4.9ghz) couple with decent ram and an SSD, ive never had a single issue playing APB, even from RTW days i had a core duo overclocked to 4ghz...
so i've only been saying this for about 9 years ...