Lag, crashes, and "server is overloaded" warnings are very often a memory problem rather than a CPU one. Minecraft servers do not automatically use all the RAM on the machine they run on; the amount available has to be explicitly allocated, and getting that number right makes a real difference to performance.
If you self-host with the server jar
RAM is set using two startup flags when you launch the server: -Xmx for the maximum amount it can use, and -Xms for the amount it starts with. For example:
java -Xmx4G -Xms2G -jar server.jar nogui
This allocates a maximum of 4 GB and starts the server with 2 GB reserved. To change the allocation, edit the command (or the startup script/batch file you use to launch the server) and adjust the numbers, then restart the server for the change to apply. A Java arguments generator can build this whole startup command for you, including performance flags most guides leave out. Setting -Xms equal to -Xmx can reduce stutter caused by the server resizing its memory pool during play, at the cost of reserving that memory even when it is not needed yet.
If you use a hosting panel
Most hosting control panels expose RAM as a simple slider or dropdown in the server's settings tab, rather than requiring you to edit a startup command directly. Changing it typically takes effect on the next restart, no manual flags needed. This is one of the more meaningful advantages of hosted servers over manual setups: resizing RAM is a two-click change instead of editing scripts.
How much RAM do you actually need?
As a rough starting point:
- 1-2 GB — a small vanilla survival world with 1-5 players.
- 2-4 GB — a vanilla world with more players, or a lightly modded/plugin server.
- 4-8 GB — a heavily modded modpack, or a busy plugin-based server with 10+ concurrent players.
- 8 GB+ — large modpacks, big render/simulation distances, or dozens of concurrent players.
If you would rather not guess, plug your player count, mod list, and edition into a Minecraft RAM calculator for a specific recommendation. Giving a server far more RAM than it needs does not make it faster, Minecraft's server software (particularly the Java garbage collector) can actually perform worse with an oversized heap it never needs to use. It is generally better to allocate close to what the server realistically needs and increase it only if you see out-of-memory errors or noticeable lag with more players online.
Adjusting as you grow
The right RAM amount for a brand-new server is not necessarily right six months later once you have added plugins, more players, and more explored terrain. Keep an eye on your server's memory usage (most panels show this live) and bump the allocation when it is consistently maxed out. Tick Hosting's plans make this a one-click adjustment from the dashboard, no startup flags to remember. Compare RAM tiers on Tick Hosting's pricing page, including the free tier if you are just getting started.