[horsawlarway]

I would say that's within a believable range of improvement (although on the high end).

We're playing with ESBuild at work, TS/React build that takes 45+ seconds to run with webpack cold, 8 second for a rebuild. With ESBuild/Gulp, the full gulp watch task will refresh in about 1.2 seconds, of which ESBuild ran for about .4 seconds.

So the builds are ~100 times faster with ESBuild, and we're just running it cold every time because it's so fast.

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It's also really exciting for run-time based compilation. I've been playing around with a server-side React rendering project, and I literally just run esbuild in the controller action in development (some prebuilding for releases) and it's wonderful. Live updates in roughly .6 seconds on average, even for relatively heavy components.

plus, if you're careful with your react code, you can build a react codebase that will actually run if client-side JS is disabled (you can render it all serverside)