Recently my 2015 MacBook Pro started to lag a lot, especially the graphics. The animations are really slow and breaking up sometimes. Someone suggested an NVRAM reset followed by an SMC reset will fix it.
The NVRAM is working. But the SMC reset is not. I tried to hold Ctrl ⌃ Opt ⌥ Shift ⇧ + the power button up to 30 seconds. Still, it's not resetting (The color of the mag safe connector is not changing.). Any idea what's happening?
A screenshot of the activity monitor: