Hello everyone,

I'm sorry to bring up a subject that seems to be addressed a lot, and I apologize in advance for the long post but I want to give as much information as possible. I've spent the past few days googling and troubleshooting to no avail, I think at this point it's simply an unavoidable hardware issue, but I figured I would give a forum post a shot.

Brushes, especially wider ones, are laggy to the point of being unusable. I don't think I'm using an excessive size (but I could be wrong, I'm new to digital art)- around 70 pixels seems to be around where the lag gets too irritating. At a smaller size the lag is not as bad but still there, bigger does not necessarily get much worse. Brushes that are smaller by design (such as default inking pens) are better. It's significantly worse with long strokes. I've tried canvases of varying resolution & size, lower res/size helps but still lags.

What I'm running on:
Surface Pro (1st Gen)
Windows 8.1
Intel i5 processor
Intel HD 4000 graphics card
4 GB RAM
Fully updated, though there is apparently one new version of my graphics drivers available directly from intel, however it's not actually designed for the surface so you have to do some weird jerry-rigging to install it that I didn't feel comfortable with. If there's no other options I might consider trying it.
Most recent release of Krita 64 bit

What I've tried:
Closed all other processes
Reduced image size (also tried new images with lower resolution/size- helps a little but doesn't fix it entirely)
Turned off OpenGL (made it worse)
Fully updated computer (see above about drivers)
Tried different scaling modes
Instant Preview was not on, tried turning it on & off again
increased Krita's memory limit (it doesn't use anywhere near the limit anyway)
increased internal pool/swap undo
Disabled vector optmizations
Reduced undo states to 1
Tried Krita Gemini (ran worse), portable (no different), 32 bit (crashed on startup every time)
Set CPU priority to high for Krita (seemed to improve very slightly)
Tried turning off &/or on auto space & precision for brushes (no different)
Tried viewing image at 100% and working on it there with relative brush sizes, which are smaller at 100% view. (Not only did this not help much but is not really feasible on a small tablet screen)
Turned off texture buffer
Tried 16 bit integer/channel instead of 8
All reporting/logging options are turned off

I think there was more but that's all I remember. Unless otherwise stated nothing really helped. Like I said, at this point I'm not expecting there to be anything else but I'm still a little hopeful. I love Krita, it runs beautifully on my desktop and I bought my Surface Pro specifically to be able to use Krita on the go, so I'm really disheartened that it seems I may have to change to another program.

Thank you for your time

What is the size of your canvas? The first generation surface pro is pretty old, and the processor pretty slow, but you should be able to work on a 300 dpi A4 canvas with that sort of hardware without problems -- and 70 pixel isn't a big brush. Have you tried tweaking the spacing parameter of the brushes?

I've tried a variety of sizes/resolutions, including A4 at 300ppi, and they all lag.
It seems to lag less on higher spacing settings, it's not entirely gone but it's at least tolerable, thank you.