Standard 32-bit executables are limited to 2GB of virtual memory by default. When you add modern features to M.U.G.E.N, such as:
Because M.U.G.E.N is a 32-bit application, it is architecturally limited in how much RAM it can address. Applying a "Large Address Aware" (LAA) patch—often referred to as the 4GB Patch—is the gold standard for stabilizing the engine and allowing it to utilize the maximum possible memory on modern 64-bit systems. Why You Need a Memory Patch for M.U.G.E.N
The tool will notify you that the executable has been successfully patched. You can now run your game with increased stability. Common Misconceptions: 8GB vs. 4GB
The most trusted tool for this is the , which is widely recommended across the M.U.G.E.N community.