I have had a problem with using tonal balance vst in cubase 11…The graphics would stutter and be unusable. I contacted izotope who were helpful. But ultimately I found the cure was replacing my graphics card. That fixed the problem. My pc is an i7 processor and 16gb ram so I guessed that wasn’t the issue. Hopefully this may help someone who is pulling their hair out, like I was with this problem. 
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