• Build system is based on make. I type "make" and anything that needs building is built. 'tweak and reload' worked great. No dependencies from the JS ecosystem required other than chokidar to detect file changes
• It appears to be very fast. On Safari, "change" events are sent from the color input while you manipulate the colorwheel. You can move it a lot and see changes happen quickly. This is very fast on my previously-mentioned ancient iPad that cannot run reddit.com