Picking the right amount of RAM (the short-term memory your server uses while running) mostly comes down to how many players you expect and how much you load on top of the base game. This guide gives rough, honest numbers and a few tuning tips that stretch what you have.
Rough guidance by player count
These are ballpark figures for a well-tuned Paper or Purpur server. Heavy modpacks need a lot more, so treat these as vanilla to lightly-modded numbers.
- A few friends, up to around 10 players, light plugin use: roughly 4GB to 6GB.
- A small community, 10 to 30 players with a handful of plugins: roughly 6GB to 10GB.
- A busy server, up to around 60 players with 10 to 20 plugins: around 16GB is a comfortable target, with 12GB as a lean minimum you can run on if you tune well.
More RAM does not automatically mean smoother. It gives the server room to hold more loaded chunks and player data at once, but past a point other things matter more, which we get to below.
Get more out of what you have
A few choices make a bigger difference than simply buying more RAM.
- Run Paper or Purpur, not vanilla. They handle memory and chunk loading far more efficiently, so the same RAM goes further.
- Use Aikar's flags. These are a well-known, tuned set of Java garbage-collection settings (garbage collection is how Java frees up memory it is no longer using), and they keep performance steadier under load. You can review or adjust your startup flags on the Startup tab in the panel.
- Set your view distance to 6 to 8 in server.properties. View distance is how many chunks around each player the server keeps loaded, and every extra step costs a surprising amount of memory and CPU across a full server.
- Pre-generate the world with a world border. Generating brand new terrain while players explore is one of the heaviest things a server does. Setting a border and pre-generating inside it up front means the expensive work is already done.
The nuance people miss: CPU matters more than you think
Past a certain point, adding more RAM stops helping and single-thread CPU speed becomes the real limit. Minecraft does most of its core work, the ticking of the world, on effectively one thread, so raw per-core speed decides how many players and how much activity your server handles before it starts lagging.
So if your server has plenty of free RAM but still stutters when things get busy, more RAM will not fix it. That is a CPU-bound situation, and the fixes are lowering view distance, trimming heavy plugins, pre-generating the world, and running on faster cores.
A sensible starting point
Estimate your realistic peak player count, pick from the guidance above, run Paper or Purpur with sensible settings, and watch how it actually performs. It is easy to add more RAM later if you genuinely need it, and there is no point paying for memory that sits unused while the real bottleneck is elsewhere. If you are unsure what your server needs, ask us and we will talk it through honestly.
Still stuck? Jump into our Discord at discord.gg/GuavaHost and the team will help you out.