And I do mean unbearably slow. For instance: if I undo or zoom, it can sometimes take 2-3 seconds or more to apply the changes. And when I change the transparency of a layer, I can't see the immediate result, I have to click on the work space first, then the changes will apply. This alone makes it incredibly annoying to work but on top of all that it also generally lags a lot even if I restart the program. And no, it's not because of the image size/number of layers. It does the same thing with small files.
What I have done to try and fix this:
-Disabled colour management
-Cleared all undo history
-Changed the tile cache to 4-5GB as recommended by other Gimp users
None of the above seem to have corrected my issues. Therefore, I believe the problem is Ubuntu related and not Gimp related. Or rather, some installations/changes/deletions that I've made recently to optimize Ubuntu but that are now causing Gimp to run this slow.
What I've done recently that might've caused this:
I tried to install a bunch of stuff because I was hoping to use ffmpeg:
I installed Yasm, libx264, libfdk-aac, libmp3lame, libopus and ffmpeg. Basically a bunch of video and audio encoders.
sudo apt-get update
sudo apt-get -y install autoconf automake build-essential libass-dev libfreetype6-dev libgpac-dev \
libsdl1.2-dev libtheora-dev libtool libva-dev libvdpau-dev libvorbis-dev libx11-dev \
libxext-dev libxfixes-dev pkg-config texi2html zlib1g-dev
Since my ffmepg adventure resulted in a bunch of errors and I later learned that most of what I installed was obsolete, I wanted to uninstall most of the stuff that was now considered useless. So I followed some guide to keep Ubuntu clean. I did the following:
Cleaning up of partial package: sudo apt-get autoclean
Cleaning up of the apt cache: sudo apt-get clean
Cleaning up of any unused dependencies: sudo apt-get autoremove
And finally, I installed gtkorphan to remove ALL orphaned packages.
That's about it for the recent changes I made. I also uninstalled a bunch of programs I didn't need anymore like Avidemux, RythmBox, Banshee, Solitaire games, etc. But nothing important.
So what is it that is now causing GIMP to run this slow? And what can I do to fix this? Please help. It's so bad that I'm almost considering going back to Windows lol.