Creating svn branch with history starting from the specified svn revision

It's not possible at the moment to fetch only a part of the history (bzr doesn't support stacking on non-native branches).

If it's the "fetching revision info" step that is taking a long time, then you can probably speed the process up by setting the use-cache variable in ~/.bazaar/subversion.conf for the relevant repository to False.

Now I got bzr error: out of memory.
If I don't need the history before some revision, would it be possible to begin fetch from it like if it was revision 1?

No, that's not possible at the moment.

Are you branching from the actual branch, or perhaps from the repository root? If the latter, then please use "bzr svn-import".

I'm braching from trunk, not from the root.

Is it possible to implement this feature? Or there are some architectural difficulties?
Maybe if you pointed me the necessary places in bzr-svn sources, I could implement it myself.

Are you sure that the amount of memory used is actually caused by the fact that the history is this big?

In general, bzr-svn should just take longer for larger histories, it shouldn't be using more memory.

Does the branch perhaps contain very large files?

It requires a significant amount of work (mostly in bzr itself, not bzr-svn) to support partial history.

Yeah, there are some large files of size about 200-300 mb.
Need 64bit bzr...

It should be much easier to get a hold of a 64-bit bzr than to support partial fetches.