Minecraft has plenty of performance mods, and they're great. But in my experience, they don't always keep the server performing perfectly. For example, consider a player who explores aggressively and forces the server to load many chunks. In that scenario, no typical vanilla-friendly performance optimization keeps it from lagging. So I created this mod (similar standalone mods do exist, but none quite do it the way I wanted). It scales performance-dependent settings like view distance, simulation distance and mob cap based on the average milliseconds per tick (MSPT). When MSPT passes a configured lag threshold (near the ideal 50ms max per tick), settings scale down, and they scale back up once it drops below a recovery threshold. The settings are scaled according to configured performance levels. You can specify which gets changed first, how much, and so on. The check interval is also configurable; its default is 15s. This keeps the performance impact of this mod minimal. All of this will certainly improve the playing experience on a weaker server. Have fun trying it out!