I have the same issue. It used to be worse, but after a long SP tech exchange we ended up changing my small form SP key for a normal sized one and that helped. I do still have some lag, but not as bad as before.
My computer is pretty powerful, especially for a laptop. When working with SP tech, my specs were better than theirs. The program & files are installed on my SSD. No other programs I use have this issue. I use Twin Motion extensively and it powers through effortlessly.
An example, I just edited a stove and it took 9 seconds for the edit window to open after I clicked on it. I plan to start another ticket, but now isn't the time. I'm too busy.