To verify this, we built a test and we discovered that, really, we called too rarely the garbage collector. After some rework, we are releasing version 6.3.1 that resolves this bug.
To have an idea of Caledos memory usage, you can see a comparison of memory allocation in V6.3 and V6.3.1 in the following graph.

(perfmon.exe - y range 1Gb RAM – x range 2 hours – new wallpaper every 2 minutes – images of >10Mbps each)



