I can no longer move due to this. According to some old bukkit threads this was added to prevent fly and speed hacks without Nocheat plugins. I am currently standing still and this is spamming my console:
16:24:53 [Server] INFO [16:24:53 WARN]: TimeTheCat moved too quickly! 0.0,0.0,0.0 (0.7362446254261049, 17.287364536482865, 0.8210849952264293)
16:24:53 [Server] INFO [16:24:53 WARN]: TimeTheCat moved too quickly! 0.0,0.0,0.0 (0.8090600046238042, 17.720167551044256, 0.90229117754165)
16:24:53 [Server] INFO [16:24:53 WARN]: TimeTheCat moved too quickly! 0.0,0.0,0.0 (0.8890769025349831, 18.161803271593087, 0.9915287379535977)
16:24:53 [Server] INFO [16:24:53 WARN]: TimeTheCat moved too quickly! 0.0,0.0,0.0 (0.9770075570460881, 18.61245195725981, 1.0895919883273744)
16:24:53 [Server] INFO [16:24:53 WARN]: TimeTheCat moved too quickly! 0.0,0.0,0.0 (6.162770979767413, 19.08425378642975, 1.9269531527595067)
The server is at 20 tps and my ping is 32ms. Also, I do not have anything that changes my speed.