Topic: Video suddenly becomes laggy one day, no changes made to the system

I have encountered this problem 3 times in my life. One day suddenly, out of no where, video playback at 144 fps becomes laggy, video index < 1.00. No changes were made to the system. I have checked the CPU usage and made sure no other programs are eating up CPU resources. Videos that used to play perfectly at 144 fps with 60-70% CPU usage yesterday suddenly becomes laggy with 99% CPU usage today. What's even weirder is that if I disable GPU acceleration, the CPU usage drops and the video becomes less laggy, but still not good. Last time I solved this problem by updating GPU driver. No luck this time. The first time I even ended up reinstalling windows. Did anyone also experience such strange issue?

CPU: i5 3470
GPU: GTX 1070
OS: Windows 10
Player: MPC-HC x64

Re: Video suddenly becomes laggy one day, no changes made to the system

This time I get it fixed by DDU and clean install GPU driver

Re: Video suddenly becomes laggy one day, no changes made to the system

probably a video post-processing turned on in the driver
just a guess...