Re: [Gimp-user] Large window size causes lag


On Mon, Oct 6, 2014 at 2:40 PM, antiart <forums 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 WINDOW
size makes the cursor slow.
I have a new Lenovo z50-70, which is fairly fast and powerful, fresh install of
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 disabled/tested
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 to
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. There
is still the same lag, no matter if fullscreen or maximized.

And just for the record: None of the other painting application have this issue:
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
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