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Hi. I'm trying to build a server that handles udp communication using raw sockets.
However, when I open multiple sockets, the communication seems to be delayed by about 5000ms. Is this because ktor is not able to handle multiple sockets async or something?

I'm not familiar with Ktor, but if performance proves to be an issue I'd recommend Vert.x. It's a high-performance toolkit, with decent support for Kotlin &amp; coroutines.

<https://vertx.io/docs/vertx-core/java/#_datagram_sockets_udp>
<https://vertx.io/docs/vertx-lang-kotlin-coroutines/kotlin/>

ktor's raw-socket is a experimental feature, so it may be more stable. I'll try using that one! Thank you!

5000ms is not likely 'performance related' -- I suspect a ktor limit or bug