So guys my problem basically is lag, so I had a Pentium 4 PC which was like 20+ years old. So I used to play GTA: San Andreas on that PC without any Graphics card and I had 4GB ram and CPU was like 3.0GHz something and the game ran 30+ FPS easily. So I just recently upgraded to a Core 2 duo and it has 4GB ram 2.8GHz speed and Windows 10, and it never goes like more than 10 FPS, My C: drive has like 1.5GB space remaining, so I really want to know the cause of the lag which will be really helpful for me, Thanks.