I don't think more code will be a big problem for javascript. It seems to mostly affect start up time. Look at the asm.js tests with Massive. Also think about a

I don't think more code will be a big problem for javascript. It seems to mostly affect start up time. Look at the asm.js tests with Massive. Also think about all js projects that use anywhere from 10 000 lince of code (LOC) to 100 000 LOC. I haven't heard anyone saying that the runtime got into any problem. There is always some problems with organizing that amount of code but that is true in almost any language. And javascript is actually quite effective to write in meaning a js program is probably much shorter than the same program in Java (at least before Java 8). http://kripken.github.io/Massive/ http://kripken.github.io/Massive/ I just remembered that there are demos of Unreal Engine running in js with a lot of LOC and fast performance.