Fix Project Zomboid “Out of Memory” / Low RAM Crash (2025 Ultimate Guide – 300+ Mods & Max Zombies)

C:\Program Files (x86)\Steam\steamapps\common\Project Zomboid\

Right-click → Edit with Notepad.

It should look like this by default:

"vmArgs": [
"-Djava.awt.headless=true",
"-Xmx3072m",
"-Dzomboid.steam=1"
],

"vmArgs": [
"-Djava.awt.headless=true",
"-Xms16g",
"-Xmx32g",
"-XX:+UseZGC",
"-XX:+AlwaysPreTouch",
"-XX:+UseStringDeduplication",
"-Dzomboid.steam=1",
"-Dzomboid.znetlog=1",
"-Djava.library.path=win64/;.",
"-XX:-CreateCoredumpOnCrash",
"-XX:-OmitStackTraceInFastThrow"
],

-Xms32g
-Xmx64g

At startup you should see in console.txt:

Memory max: 32768.0 MB
or higher – that means it worked! ✅