Mouse problem

I saw this: https://www.riscosopen.org/forum/forums/5/topics/3916
It works well. But…

When RPCEmu is launched, mouse is stuck to the bottom left corner, until you reset RPCEmu, or go to wimp.
I don’t want to use Wimp, as “Reduce CPU usage” is not very efficient there.

Do you know what in the initialisation of Wimp make the mouse working normally under RPCEmu?

It’s not a mode change, or MOUSE ON/OFF/TO.
It’s not something in !Boot, since Wimp unlock the mouse here without !Boot.

Of course, I could launch Wimp. But then, how to quit it? :)
(anyway, that’s not a real solution).

Nota: CPU stay below 1% when idle. Less than 2s after high load, it comes back to 1%
With Wimp, you must wait much longer. Why? Good question.

Other points: under RPCEmu, RISC OS 5 still have problems after a mode change (probably a RPCEmu problem).
“Reduce CPU usage” takes a very long time to work under Wimp. That suggests a high CPU load long after boot and apps launch. Strange.