I accidentally got permanent speed and jump boost on Minecraft, and its really annoying! Is there any way to disable this?
That depends on how you obtained these effects.
If you obtained these effects using a potion or the
/effect command, then you can drink milk to get rid of them, or use the command
/effect Username clear to clear all potion effects. In-game testing shows that milk does, in fact, get rid of the speed and jump boost effects; it's not just useful for poisoning.
If you obtained the effects by way of beacon, however, get rid of the beacon or change the effects the beacon gives. Drinking milk will work for a couple of seconds, but the effect quickly replenishes itself.