Hi!
I have been facing this issue since High Sierra but it has been unbearable in Catalina. If the mac is put to sleep for more than an hour the iGPU speed tanks to 200Mhz and doesn't boost at all.
This causes the UI to stutter and makes the whole system unusable. Only a restart fixes it.
I also noticed that if I play a video in Safari on youtube the GPU boosts up to 600Mhz and UI is smooth again, but this only lasts till the video is played.
I have already -
- Reinstalled Catalina from scratch
- Reset PRAM and NVRAM
- Accessed the activity monitor for any unusual CPU usage
I have been facing this issue since High Sierra but it has been unbearable in Catalina. If the mac is put to sleep for more than an hour the iGPU speed tanks to 200Mhz and doesn't boost at all.
This causes the UI to stutter and makes the whole system unusable. Only a restart fixes it.
I also noticed that if I play a video in Safari on youtube the GPU boosts up to 600Mhz and UI is smooth again, but this only lasts till the video is played.
I have already -
- Reinstalled Catalina from scratch
- Reset PRAM and NVRAM
- Accessed the activity monitor for any unusual CPU usage