profile and tune performance

[Jared-Sprague]

I noticed some lag on the laptops

[mwcz]

@Jared-Sprague Sitting backstage waiting on keynotes, I was doing some profiling. I think I found one source of lag. When a block is captured we call block.generateTexture() but it isn't used for anything. It lit up in the profiler. I removed it in branch no-generate-texture see commit: 9d32182

When I removed it the game ran noticably faster on my laptop.

[mwcz]

Other than that the only source of lag I saw in the profiler was garbage collection. We have a lot of let and const in our functions and they build up the heap until the GC kicks in. I saw a few "Major GC" in the profiler. I don't think we can refactor that quickly enough though. :)

[mwcz]

If the branch looks good to you, merge away. I wanted to get your thoughts first