I'm sorry for my bad english, in any case I want the player to run faster without me having to give him an effect how do I do that?
Do I know? It all depends on how (when?) you want it to be done. But learning how to use events is out of scope of this question.
You need to somehow block this method from executing: https://github.com/pmmp/PocketMine-...746480a/src/pocketmine/entity/Living.php#L326 I think that could be done by listening to DataPacketSendEvent.