Pops and Crackles

I’ve checked the ASIO performance and I am getting a reading of between 25 and 30% on a track with 12 audio tracks and 1 FX track with reverb. I know that knockingout some of the win processes will help but I think there is something else causing this? I would exptect something similar if I had a load of VST’s working but there is none on this track?

Cheers