I also tried rendering same new project in my PC using Adobe Premiere Pro CC 2020, but even that achieved same poor rendering results with very low CPU usage.

Interesting thing is that when I render old project in laptop which was created in Adobe Premiere Pro CC 2019 using Adobe Premiere Pro CC 2020, I don’t have any such issues, so it seems the issue is specific to the new projects created using Adobe Premiere Pro CC 2020. I have tried several tutorials on this and tried several optimisation settings, even tried rendering in Adobe Media Encoder CC 2020 with different settings but none helped fix the problem. I’m using CUDA for rendering engine (I tried openCL & Software only as well). I noticed CPU usage is very low (max 24%) and GPU is barely ever used.

However, my recent project (in laptop) & I think my first project in Adobe Premiere Pro CC 2020 is rendering very slow, same is the issue with rendering previews. Up to Adobe Premiere Pro CC 2019 I didn’t encounter any rendering issues & CPU usage (and in between GPU usage as well) used to be very high (40% - 100%) during rendering (even in laptop, no issues). I have been using Premiere Pro since Adobe Premiere Pro CC 2018 in my PC (not laptop). I recently started working on a new video, editing it in Adobe Premiere Pro.

Shotcut slow down video