There aren’t any workarounds I’m afraid. There’s a way to force the game to still work on 1.0.50 but it’s 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