Ue4 slow viewport

Hello i was running 14.1 and updated to 14.2 on a 2015 macbook pro retina. Yesterday nothing was wrong, but before the update today my viewport was slower than ever. when i try to drag to right with alt+LMB it takes about 10 seconds before somthing happens. Can it be cache or something?? i don’t know what to do now, this is not workable. Suggestions anyone??