If the “jittering” you referring to is the jerky and stuttering rendering, then yes, I am noticing it as well. Performance has apparently suffered in recent X-Plane releases (e.g. 11.32). I think the continuous features and special effects additions have taken its toll.
I have a decent machine as well. But lately when flying into airports with add-on sceneries, I commonly encounter jittering, worse when flying more complex aircraft. You didn’t mention what CPU you have, but my guess is the jittering are CPU-related. I found that tuning down the “Number of World Objects” helped, sadly!