Hi,
I am new to this forum, relatively new to linux and new to Krita. I love it so far and I am enjoying using it as a sketching tool. There were just one or two issues I am trying to rectify that are kind of hard to explain. SO ...I will try and hopefully someone can explain or possibly offer a solution,
I am on a fresh install of Linux Mint with KDE Plasma desktop installed. Video card is Nvidia fx560ti with latest driver (3.10 propriety) installed.
The issue I am having, is when a canvas is created (a5) with 16 bit or higher color space and ppi of 300, the brush reacts slowly when enlarged, or transform operations also react very slowly. I have tried enabling/disabling opengl in the krita config menu. There seems to be a lot of lag when "painting" under these conditions. I have 8gb of "good" ram. Watching my ram usage monitor, it never goes above 2.4/2.7gb. DOes anyone else have this problem??? Using 8bit works fine. I am primarily using Krita for grey scale sketching. I am interested to know if it will matter much when I decide to start painting in color???

I have swappiness set to 0, Mint is installed on xfs formatted ssd.
CPU:is i7 2600k @3.4ghz
RAm 8gb
M/B is GIgabyte
8gb of swap space on ssd
I am going to try setting swappiness back to 60 and rolling back to to nvdia driver 3.04 and try experimental/nouveau /binary etc. and see if that helps. I have experimented with lower ppi settings but, doesn't seem to do anything. IS this even the issue??
I am happy to sketch at the moment in 8 bit greyscale.

Can anyone help or offer any insight?? Do I even need a 16 bit or higher canvas for painting in color?
Thank you
Regards,
Rick
Forgot to add, I am on Krita 2.5.x, latest release as of today.

16-bit is usually a bit slower than 8-bit, so large brushes may lag a bit. OpenGL doesn't change painting performance that much, you should normally notice it during zooming or rotation of the canvas. To improve performance you can try to make the spacing of the brush bigger.

If you need 16-bit depends on your task. There are many artists who can work with 8-bit just fine.

Thank you for the reply,
I found the issue was greatly reduced when I switched to the 3.04 nvidia driver and enabled openGL but unticked "tri-linear texturing". WIth those settings I was able to use a 16bit, a5 canvas at 300ppi with no lag on the brush strokes and very little lag when using the move layer tool. So there must be something going on there, not sure.
I am still a bit new to digital painting/sketching, is an A5 canvas over kill. I realize alot is personal preference.
Thanks again, Love the software! CAnt belive it is free!