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January 14
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Are you working with a ton of big layers?  If you work like I do, you are probably making use of a lot of layer masks.  Although I love layer masks, using them means that you are also requiring Gimp to keep a lot more data, some of which is not even on the canvas, and never will be.

For example, let's say you are using fur from a photo of a wolf.  Most of this image (the head, eyes, ears, and the rest of the body in general) is not being used.  Plus, the photo is probably a high-resolution photo may be rotated awkwardly, so that most of the image is not even on the canvas.  If you do this 10-15 times, you will begin to notice that Gimp will start to crawl.

To fix this, you're going to want to do 2 things.

1.) make sure you have Gimp optimized for your computer by watching lesson 2 of my gimp for beginners series here: [link]

2.) occasionally click on the crop tool, and crop the image equal to your entire canvas.  Doing this will have no effect on your final image, but it will cut out all of that extra "stuff" outside of your canvas that you're not using.  I've had image files drop in size from over 200 MB to under 100MB just from doing this.  You can almost hear your Gimp sigh in relief.

These two things will have a dramatic effect on how will Gimp runs on your computer, but you also may find that it is still running a bit sluggish even after doing all of the things above.  If all else fails, there is a well-known bug in Gimp 2.8 where the color management can sometimes make Gimp come to a crawl.  Try turning off the color management in the preferences window.  More speed tips, check out lesson 2 in my gimp for beginners series.

Hope this helps you guys!
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:iconwastelander7:
Good tips! And the image crop would work with 2.7 and 2.6
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:iconvampireryoko:
*VampireRyoko Jan 16, 2013  Hobbyist General Artist
thanks for the tips on 2.8. I still use Gimp 2.6 but have tried using the new version. I noticed there are a lot of differences but my main issue is when i tried to save as a png or psd there was no option for it or even jpg for that matter. I'm hoping that was just a glitch since i was using 2.8 on another computer. But because of that , i'm not sure if i want to update my version. And when i saved the wallpaper from 2.8 and tired to open it with 2.6 after i transferred it. it actually didn't work.
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:icontheoneandonly06:
Hey VampireRyoko,

Check out this post on exporting in Gimp 2.8:

[link]

There was a paradigm change in how it works, and it is actually better once you understand what they did.
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:iconvampireryoko:
Mood: Joy *VampireRyoko Feb 17, 2013  Hobbyist General Artist
I finally found you... haha Thanks so much for thin info. It makes much more sense this way and it's a lot easier. You are the best! :hug:
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:iconnexu4:
~Nexu4 Jan 15, 2013  Hobbyist Photographer
I still have problems using Gimp 2.8 on Win XP, it's slowly and the wacom tablett doesn 't work, so I'm still working with gimp 2.6.11 .. :iconkermosadplz: I hope the next version will fix this, or do I something wrong? .. anybody knows?
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:icontheoneandonly06:
Did you try all of the tips mentioned above? Often times the sluggish speed is a result of the color management bug. Try turning it off.
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:iconnexu4:
~Nexu4 Jan 21, 2013  Hobbyist Photographer
someday I will have a new try, but perhaps I wil waiting for a new version...
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:iconlachoneus:
~Lachoneus Jan 15, 2013  Professional General Artist
I was just trying to figure out how to crop all the layers in a project at once. Thanks for the tip!
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:iconxgreatcthulhux:
~xGreatCthulhux Jan 15, 2013  Hobbyist Digital Artist
It's nothing I didn't already know, but anyway: THX for sharing these Tips! Many people were already asking me about several issues, and journals like this help unexperienced users to get some clearer views to the software! Thanks for your efforts!!!
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:iconshade-of-wolf:
~shade-of-wolf Jan 14, 2013  Hobbyist Digital Artist
Thanks!
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