Some smaller suggestions:
- Loading plugins (VSTfx,VSTi) in the background (parallel) to improve loading time of songs. Renoise freeze for several seconds on songs with heavy VST’s usage.
- Initialize midi controllers in the background, too. I’ve a midi controller connected via bluetooth. When it’s not powered on, renoise will freeze for 1-2 seconds till a error messagebox appears.
- A big one: luajit for tools could improve the cpu usage for heavy tools.
- “Instrument racks” is something i’ve suggested before: Idea: Supercharged *vsti* instruments