Is the plugin EntityTrackerFixer necessary on a 1.15.2 PaperMC server? And more importantly, does it actually prevent lag in 1.15.2? It sounds promising, but I’m just wondering why I have never heard about this plugin. If it works, surely it should be mentioned in the various optimizaton posts like this big one by Celebrimbor. Edit: Now that I clicked on the “Fix Entity Lag” plugin link in the aforementioned optimization thread, it actually links to EntityTrackerFixer. It says that this plugin is only recommended for “severe entity lag” and that unknown bugs may exist (which is true for all software). That thread was written over two years ago, though, so the plugin might have improved in recent years.