Hi Martin !
– Maybe try to purge your cache if it’s not done yet. EDIT > PURGE > ALL MEMORY AND DISK CACHE.
– Also, you can go to the preview window a crank up the “Skip frame” value. It’s not the best to see exactly what you are doing, but it gives a pretty good idea what the result looks like, and if you’re in a rush …
– Disable the Motion Blur if it’s on !
Hope it helps, cheers !