taken from: this resource
In most cases, if the version control system Subversion's performance is discussed, the topics revolve around the repository backends used (Berkeley DB (bdb) vs. FSFS) and tuning some server software or even hardware parameters.
It seems to be less known that the choice of the server variant used - the Apache Subversion mod_dav_svn module or the standalone svnserve server - have a great impact to measured and perceived subversion performance.
Usually svnserve is significantly faster than Apache mod_dav_svn
In a synthetic, non-representative benchmark test I performed using Subversion 1.4.5, Subversion 1.1.1 and Apache 2.0, mod_dav_svn's performance was 30% to 400% slower than svnserve's. svnserve's performance was close to local direct accesses to the repository using the svn command line tools.
The most significant performance penalty was measured during svn log and svn merge operations against the mod_dav_svn server - you'll notice worse svn log performance immediately if eg. using the Eclipse Subversion plugin Subclipse.
The author also provides a benchmark comparing the two.
I run snvserv that serves about 50 repositories on BerkelyDB backends and have had no complaints on the performance. As a side note there's only 10 users though.
I actually found svnserve very easy to install and maintain and doesnt penalty you in lack of futures. SSH can be enabled for svnserve and path based security is also possible if your the '"one repo, many projects" kind of guy' Steve Robbins talks about :)