One thing that can probably be said is that the general ram usage of krita should be smaller, but it will always be the case before and after anything and I believe devs are already aware of this since the beginning of this project.
Krita already does what it can about allocation/de-allocation of memory, and memory sanity is good.
After, by allocating 2GB RAM for Krita as you have 10GB on your system, I understand better now what you’re always complaining that Krita is slow and memory consuming… Krita might take most of it’s time to swap data…
That let me think that in this condition, even if everything was processed by GPU as you ask, it might not change anything in your case… 
2GB RAM is not enough especially if you’re working on large image size.
And rather than asking Krita’s developers to optimize thing to let you work with 2GB RAM allocated, maybe use browser that are less memory consuming if it’s the reason why you reduce limit of Krita to 2GB RAM 
Concerning undo history, just reduce to 100MB for example.
It will free 600MB of RAM… And undo will continue to work (a little bit slowy because in this case undo actions are stored on disk instead of memory)
Grum999
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It is simply hard to work on large images with any application on a machine that has less RAM than a modern Phone. I bet it’s not only RAM, your CPU is probably weak too, which makes things even slower.
A good CPU and plenty of RAM are mandatory yes.
But so few RAM allocated to won’t help.
On a computer with 10GB RAM, on big images, by allocating 8GB instead of 2, even with a CPU that is not a formula 1, you can get better results.
Grum999
manual memory cleanup in one click, be it the cached RAM memory, or undo history states
Memory is automatically released when you close all the documents. We cannot release memory before all the documents are closed for one reason: if we try to do that, “one click memory cleanup” will take about 4 to 5 minutes. I don’t think it is a good idea to make the user wait this time.
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novames00,
Months ago I posted a question similar to yours. The explanation they gave me was very didactic. So I suggest that you read it.
I even quote the photoshop ‘purge’ command. I believe this is what you would like Krita to have.
Here it is:
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