OMNIA II (I8000)

Does anyone know how to crack winmo in Omnia II and replaced it with more effecient OS?

I read a lot of feedback that this phone lag because its hardware is not fully utilized by Windows.

I read a thread in News about HTC Sense-based being used to Omnia II.

[ROM] HD2 Leo2 Fusion / BETA 2 RELEASED TODAY - WinMo @ MoDaCo

I hope someone could give me an info how to flush the winmo OS.