FOSS gamedev and creative worlds

For some reason the latest 0.4.11 daily builds have cut my frames per second in half... Where 0.4.11 was running at a smooth 30fps and over, Build 3404 for linux/ubuntu is running 15fps and is jittery... Wonder what's been changed ?!?!

Update: Pressing F1 to turn off HUD jumps framerate back up to 40fps so something is up with that it seems...

Fixed in latest git version.
Thanks

Kewl :) thanks guys... *testing*