UO had rubberbanding rampant - that is, you&#x27;d move on the client, then warp back to an old position after the server said you actually didnt move there.<p>It was terrible.<p>Most all MMOs with WSDA movement trust the client to set the player&#x27;s position and it mostly works. Cheating through warping or speed is easily detectable through other means of post-verification and banning players that fail that verification. It makes the game feel more fluid to the player while still not really allowing cheating.<p>Everything else is generally handled serverside which is fine because it mostly doesn&#x27;t need as high a reaction time as movement to feel natural.<p>If speed&#x2F;warp hacks are a problem, it&#x27;s not because the developers that use client-set-movement aren&#x27;t able to fix it, it&#x27;s because they don&#x27;t care.