The Lighthouse test tool in Chrome, commonly used to test real-world application performance.

TeaVM apps score quite well on Lighthouse. Previous iterations of CheerpJ had challenges in startup time and download size. Results here: https://renato.athaydes.com/posts/comparing-jvm-alternatives...

For a concrete test, try launching this full TeaVM/Flavour 5-letter word game, it downloads in <2s even on mobile. https://frequal.com/wordii/