Try turning off Photogrammetry.
WU6 broke something when Photogrammetry is ON when taxiing and taking off. Regardless of airport, plane, location etc. Huge stutters and FPS drop when taxiing onto runway (almost always at the exact same spot) and when taking off (just before reaching rotate speed… so not annoying at all /s)… seems to clear up once you reach 500-1000 feet and gets smooth again. Same thing in reverse when landing…
With photogrammetry OFF… all normal pre-WU6 performance on the ground…