I have been in a rabbit hole of all the threads related to slow zoom in a locked viewport in paperspace. My machine works just fine. But my boss's machine has this issue which makes me believe it's a variable of some sort. I have done everything all the other threads of said to do. Changed my location of .ctb files. Checked my viewres, lwdisplay, verified visual style, etc. I tried everything and nothing works. It appears this issue has been around for a decade. Has anyone encountered this and know how to fix it?