Comment 2 for bug 1095702

I believe that this is related to my recent changes to text rendering. I was expected something like this to happen and I am already working on a fix - though it is non trivial and might take a while.

The problem is that the text render is doing heavy caching, but the cache is never prunend currently. I did this on purpose, because I wanted to build a more general system that also caches images and reloads them from disk when they have not been rendered for a long time. This is WIP.