Cubase 12 Pro New Plugins causing Issues

Hello Everyone,
I’m working on a project with over 60 channel tracks. Everything was running smoothly until I added a couple of new plugins from Brainwork.
The SSL 9000 channel strip and the API channel strip.
I’m having the same problem on both of these plugins. Disk cache starts peaking .
I have Nvme ssd drives from western digital h850x.
I know it’s not the drive , the read/write on those are pretty good.
Anyone having the same problem with those plugins?
I was running on Asio guard “Low” and
Buffer Size 64 . Until I installed both of these plugins.
Had to select Asio guard “Normal” and Buffer Size up to 256. Still having the same problem.
Win10 , UR22C , amd5900x