Strange performance issue CPU jumps to 25% for 10 seconds...

i’m working on a mix in cubase at the moment using warped audiotracks… normally i use ableton for this but i prefer cubase. all the tracks have audiowarp turned on, however… everytime i move an event or do anything the cpu jumps from 2% to 25% for about 10 seconds then stops… it’s really strange
has anyone else encountered this ? is it because i’m audiowarping such large tracks?

when i say mix i mean DJ mix of full tracks btw