git svn's performance issue and strange pauses, and other thing

(I am not on the list - please CC)

Thanks for git-svn - I use it instead of subversion itself for many years now.

Just thought I'd ask/report a few issues I noticed for some time now, of tracking development of a particular subversion-based development project. Broadly speaking, I think there are 3 problems, especially noticeable against a particular repository, but to a lesser extent with some others too.

- just doing "git svn fetch --all" seems to consume a lot of memory,
for very little actual fetched changes. (in the 2GB+ region, sometimes).

- "git svn fetch --all" also seems to take a long time too, for certain
fetched changes. (in the minutes region).

-  I know I can probably just "read the source", but I'd like to know
why .git/svn/.caches is even larger than .git/objects (which supposedly
contains everything that's of interest)? I hope this can be documented
towards the end of the man-page, for example, of important parts
of .git/svn (and what not to do with them...), without needing to
'read the source'. Here is part of "du" from a couple of days ago:

254816 .git/objects 307056 .git/svn/.caches 332452 .git/svn 588064 .git

The actual .git/config is here - this should be sufficient info for somebody looking into experiencing the issues I mentioned above.

--------
$ more .git/config 
[core]
	repositoryformatversion = 0
	filemode = true
	bare = false
	logallrefupdates = true
[svn-remote "svn"]
	url = https://svn.r-project.org/R
	fetch = trunk:refs/remotes/trunk
	branches = branches/*:refs/remotes/*
	tags = tags/*:refs/remotes/tags/*
[pack]
	threads = 1
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