Lots of cool stuff here. But on the last point about managing renders, for my money any browser game is in a state of original sin if its logic and render loops are tightly coupled.
The Right Thing To Do is to run logic and rendering at separate cadences, with rendering driven exclusively by requestAnimationFrame. Then when the browser is minimized, RAF stops firing and rendering is skipped entirely (on top of the other benefits of decoupling logic and rendering).
The Right Thing To Do is to run logic and rendering at separate cadences, with rendering driven exclusively by requestAnimationFrame. Then when the browser is minimized, RAF stops firing and rendering is skipped entirely (on top of the other benefits of decoupling logic and rendering).