[No/Solved] Renoise Using Lua Script For Certain Actions/Draw Tool?

Does renoise 2.7 uses the lua script for any actions , for example the draw automation tool , is this based on some lua thing , if so , could this be the cause of the cpu overhead ?

Reason why I am asking , is because the latest version of blender 2.5 ( a 3d program ) uses python for some graphical stuff, and tweaking a slider always creates a massive cpu overhead .
Don’t shoot me for asking ?