Direct answer
On Minecraft Java 1.21 servers, lag and low TPS are usually a CPU problem — especially single-core / main-thread speed — not a missing pile of RAM. RAM matters for loaded chunks, players, and plugins, but extra memory will not fix a slow main thread.
If you came here wondering whether to buy more RAM or a faster CPU: start by measuring with a profiler (Spark), then size RAM for your player/chunk load and pick a high clock-speed CPU for the server process.
On Minecraft Java 1.21 servers, lag and low TPS are usually a CPU problem — especially single-core / main-thread speed — not a missing pile of RAM. RAM matters for loaded chunks, players, and plugins, but extra memory will not fix a slow main thread.
If you came here wondering whether to buy more RAM or a faster CPU: start by measuring with a profiler (Spark), then size RAM for your player/chunk load and pick a high clock-speed CPU for the server process.
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