I have tried to use Krita desktop for windows but everything works so damn hard. I would like to ask u what can be the problem, because I guess u are much more involved in the development or knows some stuffs and I can get a fast reply so....
I have Windows seven Ultimate, Processor; Intel (R) CPU G1820 @ 2,70GHz RAM: 4GB (3,96 GB usable), 64-bit System.
And every time I try to make a fast stroke the brush is lagging, the whole canvas froze, and my pc starts to be very noisy. Hope that in time most of the users will can use it well.

As I said on irc, your computer might be too slow to work well with Krita. You probably would need to limit the size of your documents, and make sure you're not accidentally using a 32 bits/channel colorspace.

Aham. Thank u

Hi.
I have a problem
With display
Krita is mirroring the interface
p.s. Sorry for my English

https://drive.google.com/file/d/0B1Gwy2BEiBc1MUIzdGk4S2w3VTA/view?usp=sharing