Comment 1 for bug 695087

I think I have a clue on what's going on, but before we fix this, I guess I'd be good to have some documentation on why we even have the cache. For this purpose, I've tried removing it from the engine (code at lp:~zeitgeist/zeitgeist/no-table-cache, but it's not ready for merging) and I'm attaching some test results.

It looks like the cache at best gives a very little speed benefit, so I'm not sure it's worth keeping it.