I wonder if the OP's issue is related to graphics problems some of us encountered when the Adaptive Limiter and LPMB/LPEQ were introduced in SONAR. These plugins could cause slow graphics and sometimes audio issues when using older graphics cards. Although, I wouldn't imagine this particular issue would occur with newer Win10 based PCs. But, the OP doesn't include specs.
It might be worth trying this work-around if you have an older graphics card and/or running Win7:
1.) Edit: C:\Cakewalk Content\Adaptive Limiter\Settings\LIMITER.cws
2.) Carefully, Edit and Change EnableOpenGL="0"
It would be prudent to create a copy of the LIMITER.cws file in case something goes wrong.
I'm not sure whether the LIMITER.cws file path is the same for Cakewalk by Bandlab. Perhaps someone would verify.
See
http://forum.cakewalk.com/FindPost/3555087 to read about the original issue (LP MB & LP EQ) in early 2017.