Alcides Segovia wrote on Apr 30^th, 2020 at 11:18am:

Stuttering (LOW FPS)  NAV /EICAS. On high end system The two displays in two different flights are stuttering when and are not fluid. The engine N1 indicator for example will make three increment jumps when going to T/O thrust instead of a fluid spook up as in the 757 for en example. The ND has the same stutter issue with the heading indicator not turning fluidly and and stuttering as one turns to render this display. This I have observed in several occasions on the take off run.

Try the fix in the below topic, it worked for me and the other user.

https://www.captainsim.org/forum/csf.pl?num=1588030772/1#1