Hi @lbruder,
If you can, direct TCP/UDP sockets / communication on a local network will always be the fastest. If you’re doing a POST request and you’re not on the same network, you can send it to the API and do a spark function instead, which might save you some processing time. A POST request directly to the core might be a lot of overhead, unless that’s something Webduino can do?
There are lots of great examples for controlling cores quickly over the local network, one popular one is VoodooSpark - https://github.com/voodootikigod/voodoospark
I hope that helps!
Thanks!
David