I've created a server that I'm running, and sometimes I see that players are complaining about lag. I jump on, and when people walk, sometimes they jump back, as if something on my server isn't running up to speed.. I've checked most of the common bottlenecks like CPU, upload speed, download speed, RAM, but nothing is really used up. With max players on my server, I use 15% of my CPU, 60-70% of my upload speed (biggest bottleneck), virtually none of my download speed, and my ram is at 30% with Windows and everything else running. I'm using a pyspades server because I can't get the vanilla one to connect to the master server.
Anyone have any ideas on why my server would have a little lag? It doesn't seem to be happening constantly, and it doesn't seem to be too much of a game-ruiner because I am able to get 32 people on my server 95% of the time, so people aren't too bothered with it.. It might not happen 100% of the time, either, but the bottlenecks were checked during one of the lags.