// SURVIVOR'S FIELD GUIDE
The Guide
Last Updated: July 31, 2026
// CONNECTION
Join in Zomboid
Why you need this
The default heap is only 3 GB, which is not enough for this modlist. You raise it by editing ProjectZomboid64.json in your Steam install and changing the -Xmx value.
Increase your client RAM so the modlist loads clean and efficiently.
Steps (Windows)
- 1Right-click Project Zomboid in Steam, then Properties > Installed Files > Browse.
- 2Open ProjectZomboid64.json in a text editor and find the line containing -Xmx3072m.
- 3Change the number to your target (see the table), keep the trailing comma, and SAVE.
DANGER
Steam updates reset this file — re-check -Xmx after every game patch. Back the file up first.
INFO
Mac players: the heap lives in Info.plist instead of the .json, not in the Steam folder.
Recommended values
| System RAM | Safe | Max |
|---|---|---|
| 16 GB | -Xmx6144m | -Xmx8192m |
| 32 GB | -Xmx8192m | -Xmx12288m |
| 64 GB | -Xmx12288m | -Xmx16384m |
| 96 GB | -Xmx16384m | -Xmx24576m |