Anyone experience lag or buffering issues. Today I got a lot of "waiting on program to respond"
Please post your system specs and more information on your project - type of video files, their origin, etc. The current version of HF has increased system requirements.
If your video is coming from a consumer device such as a phone then it will be Variable Frame Rate and not Constant Frame Rate (CFR is preferred). VFR can slow things down. Also, if you are editing in 4K and your system is on the edge, that will slow things down, too.