Hi dears. Some years ago my macbook pro Retina early 2015 had a swollen battery and we had to withdraw it. but as i was in...

well i really need help here, i have a mackbook pro early 2015 Retina, after the original battery swell and we had it removed, the laptop started to work really slow. Now i have bought a new non-original battery, the device is much more faster but i still have high CPU load, overheating and not to smooth Graphic problem... is this an SMC fault again? Please... i really need help....