Kotlin is leaning on JVM a lot, making most Java features accessible and easy to use. Sometimes, however, this results in curiously unexpected results during execution if you are trying to optimise your library and squeeze every last ounce of performance.

Andrei spent last year optimising performance of Compose on Android. Written fully in Kotlin, it relies on performance-oriented features of the language to optimize the runtime as much as possible. This talk shares some interesting gotchas about Kotlin performance and guardrails that Compose team have setup for themselves to ensure it keeps going fast.