[Marttt]

I would guess that is the CreateTimer part.

You are creating a timer every tick, that could run between 3~10 times per second if the logic enters in the CreateTimer all the timer.

You can try adding a comment // to it and check if it stops lagging.

PS: I didn't debug the whole code.
Also, there are some other "micro-optimizations" that could be done, but probably they aren't the real cause.