For the moment, DaitanMarks has been tested using a first set of about 1000 bookmarks. The speed is very high.
I have crash-tested it with about 7000 bookmarks: it is a bit slow for serving the full list, but keyword searching is good.
I suggest you do not go over 10000 bookmarks, for the version 1.0.
But with a good hardware and RAM, you virtually will not have limits.
I will try as soon as possible the jitter VM