@Estel, corduroysack, etc.

I haven't (yet) tested QtLockscreen, but I know that the Qt libraries take quite a bit of RAM, which is shared amongst the running Qt applications.

Check also here: http://talk.maemo.org/showthread.php?t=57337

You could try checking used RAM (e.g. with free) before and after running this app just to make sure. Result will most likely depend on whether you are running other Qt apps.

If you do test this, please report your findings. I might install QtLockscreen as well, but since I don't quite see the use of it (I usually unlock if I want to see what's going on), I'm not sure I will