On Mon, Oct 6, 2014 at 2:40 PM, antiart <for...@gimpusers.com> wrote:
> I can confirm this issue. Exactly what I experienced and what I tried.
> It doesn't matter if the image is 100x100 or 10000x10000 pixels, only the
> size makes the cursor slow.
> I have a new Lenovo z50-70, which is fairly fast and powerful, fresh install
> Windows 8.1, all updated and with the newest drivers. I tried both, a wacom
> Bamboo Pen&Touch and a wacom Intuos 2, both have the lag. I also
> those Windows 8 tablet PC settings like hold-pen-to-right-click and the
> "flicks". Still lag.
> My partner suggested that the issue is related to the GPU, so i tried to force
> Gimp to use the Nvidia processor, and then I forced it to the "integrated
> processor". There was no difference. I also changed all my graphics settings
> good performance and disabled the "fancy stuff".
> Interestingly I just noticed a very similar behavior in myPaint (version
> 1.1.0+gite06d414). The bigger the window, the more lag. This may be related
> (myPaint has an endless canvas, though). However, putting myPaint into
> Fullscreen kind of fixed the lagging. Sadly, this does not work for Gimp.
> is still the same lag, no matter if fullscreen or maximized.
> And just for the record: None of the other painting application have this
> SAI, Krita, Inkscape, ArtRage, Fresh Paint.
>>I am using Gimp 2.8.14 (latest version, just installed) with Windows
>>8.1 and a Wacom Intuos tablet. When I maximise, or otherwise enlarge
>>the drawing window beyond around 30-40% of my screen size, the tool
>>cursor becomes very laggy. When using the paintbrush, for example, the
>>painted area, brush outline, and even the little markers on the ruler
>>that show the cursor position, lag significantly behind the penstroke.
>>With a smaller window, the tools work perfectly. There does not appear
>>to be any lag when using the mouse to draw, even for a maximised
>>I have increased the tile cache size to no effect, and when looking in
>>the task manager it appears that Gimp is only using around 150 Mb or
>>so. I have also tried turning the brush outline off (as suggested as
>>solutions to similar problems), but this also didn't work and I would
>>very much like to keep this switched on. The problem does not appear
>>to be affected by canvas size or the amount of the canvas displayed.
This is a known bug which has actually been introduced by a recent
version of libcairo.
A solution for the time being is using an older libcairo. In an older
version of GIMP (2.8.10), save libcairo-2.dll (and maybe
libpixman-1-0.dll as well), then after updating to 2.8.14, replace the
newly installed DLLs by the 2 you saved. The lag bug should be gone.
At least that is what a user told us in the aforementionned bug report.
The actual bug will be fixed when a libcairo developer, or maybe one
of us, will look closer into this. I've been meaning to do this myself
as well, but never took the time for such a thing.
> antiart (via www.gimpusers.com/forums)
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