Here are some questions i've come up while using C2:
1) How to make zooming right (without going through floor)?
2) How to remove white stripes w/ tilemap bg w/ pixel rounding and point sampling? [solved, but not fully]
3) Where the heck are ellipse tool and text tool? (In sprite editor)
4) Can tilemap be "interactable"? (i.e. breaking tiles, colliding with specific tiles, etc.)
5) Where's exe exporter? Bring it back. No, i don't like node-webgl one.
That's nice...
now get to the point
Edit;
2) + Telling us NodeWebkit is slow , that issue happens when you have old drivers , and that also may be the cause of you having bad performance , give us your rig , I want to laugh ...
Seriously tho , go upgrade those old drivers of yours and test again , and try not to blame software for your hardware's problems