Configuration
Java & memory settings
Heap size, GC flags, and what actually matters.
Kyrbit pre-configures sensible Java flags for vanilla Minecraft. You only need to touch this if you're running heavy mods.
Heap size
Your server has a fixed RAM allocation tied to your size:
- Small: 4 GB
- Medium: 8 GB
- Large: 12 GB
- XL: 16 GB
- 2XL: 24 GB
Minecraft's generated startup command currently gives the game heap about 75% of the RAM allocation and leaves the rest for the JVM, native allocations, disk cache, and the OS. That means Small starts with roughly 3 GB heap, Medium with 6 GB, Large with 9 GB, XL with 12 GB, and 2XL with 18 GB.
GC flags
We default to G1GC with Aikar's flags, which is the community standard for Minecraft servers. Don't change them unless you have a specific reason and a benchmark.
When to ask for more RAM
You need more RAM if:
- Your console shows repeated OutOfMemoryError.
- You've installed a heavy modpack (200+ mods) and TPS is fine but the server crashes after a few hours.
The fix is almost never "more RAM than your size includes" — it's usually "fewer mods" or "size up to the next tier".
Didn't find what you needed? Open a support ticket. You'll get a real human reply, usually within a few hours.