Same here, after spending weeks trying to track down the stuttering by changing my P3D settings and all sorts of tweaks I finally came across this thread and low and be hold switching off EFB resolves the issue for me too!
I run EFB networked whilst my ASN is on my main P3D PC. Simply switching on and off the display unit introduces the stutters. Until a fix can be found unfortunately, this great piece of software (EFB) will be turned off..!
i7-5960X CPU @ 3.00GHz and 2x titan blacks.
Gary