Is it the same on all worlds or jerseys or bikes etc? any better or worse than others? (sorry if you have answered this many many times!)
I think it could be the length and pinkness of your socks!
The stutter happens everywhere. Flicker occurs at high frame rates, so Watopia and London are the worst for it and it probably wouldnāt show up on Makuri Islands even with a 5950X and 3090.
Thatās not me btw.
Iāll forgive you for the questionable sock choice then!
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It happens for me, I havenāt noticed it to be different on the ride it just seems to do it all the time. This has been happening for a lot of months for a lot of people. Come on Zwift hurry up with a fix it shouldnāt matter what pc you use it should just work. Itās not free you know Zwift. If a TV was flickering you would take it back
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flickering is back with a vengence 
capping fps to 60 seems to help with the flickering but not 100%
any other workarounds?
kinda glad I let my membership lapse
There arenāt any workarounds Iām afraid. Thereās a way to force the game to still work on 1.0.50 but itās no different any more, suggesting some server end changes that were brought in with 1.0.51 are now everywhere irrespective of launcher version.
All you can do is add your voice/vote here in the hope that they address it: New launcher (1.0.51) causing stutter on Windows systems
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Would turning on vsync or capping at 30fps help?
Still getting flickering every couple of seconds capped at 60fps.
I also replied to that thread. Seems zwift dgaf.
You should have vsync enabled anyway. 
Though I suspect driver/display sync is what is causing the stutter at present.
But yeah, capping the frame rate at something low usually sorts the flickering. Obviously this shouldnāt be necessary.