Using webpack (and webpack-dev-server) give you as small boost as it recompile only what have change. (It not the case with thing like browserify or most babel version). By switching from gulp+babel to webpack (both with watcher) I was able to go from a 5sec of compilation every time I changed a file to instant compile.
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This weekend, I was supposed to prepare a short gamedev related talk. I wanted to do copy the work of JW (vlambeer) on "The art of screenshake" and make something about juicyness and gamefeel. So I made a prototype. I thought it was pretty good so I just upload it on itch.io : http://grifdail.itch.io/bullets-vs-zombie