os3.1 - Facelift to look/work like 3.9?

[Tension]

AmigaOS 3.9 is essentially just a prettier version of 3.1 with a couple of handy features added, so there is no reason not to upgrade.  Its not like you need to upgrade any chips or anything.  

3.9 is a lot more stable than a heavily-modified 3.1

[Tension]

I have also heard its much much slower with workbench screen displays and things like that, something about that part of the os being rewritten from assembly to c between 3.1 and 3.9?

Can any techs confirm this?

Never heard it before but it sounds plausable.