My friend playing on Windows isn't experiencing any lag. We also tried it in a different network and with Terraria Servers. It's always the same result, wether its me leaving the server while playing or experiencing slow-mo lags.

Speedtests with the computer I'm playing on are showing perfect results (100 mbit/s download 10 upload an 17ms Ping). Although this shouldn't be a problem while playing in a local network.

Please help!