If you have Opinions about performance of webapps, please help me test a thing! Try interacting with the canvas here, and tell me what the performance and 'feel' is like for you, especially on older devices: http://joepie91-home.cryto.net:3500/

Scroll to zoom, hold right mouse button to drag. Work in progress; currently probably only works on desktops/laptops, and not likely to work correctly with screenreaders yet, although it *should* work correctly with assistive scrolling tools (but untested).