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Those are some incredible stats!

Do you have any insight or ideas on where the performance increases and size decreases are coming from?

Also, did you have to work a lot to get it working in TeaVM? The last I looked at it (which was admittedly over a year ago), it still required some non-trivial changes for the Java app I was working with at the time.

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I think the big win is that TeaVM has a lighter runtime and conditionally compiles only what is needed into the final JavaScript. There are tools that let Java do this now, but I think the standard runtime has more cross dependencies.

My app cross compiles to JVM and browser easily now, but I did a lot of work on the SnapKit UI framework, which is like Swing but abstracts out graphics and user input. My app used to be all Swing - that would be almost impossible with TeaVM. There is product called CheerpJ which does Swing with almost no modification, but it has a larger runtime.

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