2020.2.7f1 still has this problem. When I try to change a shader on a material, clicking the little dropdown arrow to get the list of shaders in the project takes 2-3 minutes sitting on that popup, and then the dropdown doesn’t actually even appear. This is just an example. It happens it other places too.
Hello, IOU_RAY. If you’re able to reproduce this consistently while following specific steps, please report this issue via the Bug Reporter (“Help → Report a Bug…” in the Editor) and attach your problematic project so we can take a further look. Thank you in advance!