You're looking for this: https://kotlinlang.org/docs/kmm-concurrency-and-coroutines.html#multithreaded-coroutines

@strooooke Many thanks!

JavaScript is single threaded. If you're running something in a tight loop and the loop never exits, your app will never execute any other code. Coroutines will execute on your main thread in JS.

it seems that the await() point of an async call hangs the thread. I'm using the native-mt coroutines, but that doesn't seem to help. Removing the async/await does, however. These async calls are to ktor HttpClient.get/put, which I'd like to execute simultaneously.