First look at the History card on the server page – it shows how players, memory and CPU developed over the last 24 h or 7 days. “Live from the server” shows the current state.
- Memory constantly at its limit: lots of mods, large worlds or many players need more RAM. If that's the case, the server page automatically shows the recommendation “Your server is at its limit.” with a button for the right tier. Alternatively, reduce mods.
- CPU constantly high, memory free: often it's individual plugins, a large number of animals/objects in the world or too large a view or simulation distance. Reduce these in the settings – or book a higher CPU tier. For Minecraft, spark shows the exact cause; if it lags mainly while exploring new areas, pre-generating the world with Chunky helps more than extra cores. Only for very large communities or huge modpacks where none of this is enough does the Performance location with even faster cores (current AMD Ryzen (Zen 4) / Intel Core (13th Gen) CPUs up to 5.7 GHz and DDR5 memory) help.
- Lag always at the same time: the history shows whether it coincides with many players or, for example, a backup.
- Only individual players lag: then it's usually their internet connection.
A regular restart via a schedule (e.g. at night, with a warning for players) helps many games stay stable.
More about the charts: History and performance recommendation. The status page shows whether there is a known issue right now.