Best additional command line arguments, only for performance

Boost your Unreal Engine game performance with proven command line arguments. Discover the real flags that work no myths, just effective tweaks to help you gain more FPS in titles like Fortnite.

Boost Your Unreal Engine Game Performance with These Command Line Arguments

If you’re looking to get the most out of Unreal Engine performance mode, you’ve likely come across a variety of command line arguments. But not all of them work as advertised some are flat-out myths.

Let’s start with a misleading list often found online:

-high -malloc=system -USEALLAVAILABLECORES -nomansky +mat_antialias 0

Truth check: Only one of these arguments is officially supported by Unreal Engine.

Below is a list of real and supported CLA you can safely use for performance improvement. These come straight from the official Unreal Engine documentation:

✅ Recommended Command Line Arguments

• USEALLAVAILABLECORES
  Forces Unreal Engine to use all CPU cores for better performance.
• NOSPLASH
  Disables the splash screen to speed up startup.
• NOSOUND
  Disables all sound output useful for headless testing or automation.
• NOTEXTURESTREAMING
  Disables texture streaming so all high-quality textures are loaded at once. Great for high-end systems.
• NOFORCEFEEDBACK
  Disables controller vibration.
• NOHOMEDIR
  Prevents Unreal Engine from using the My Documents folder as a home directory.
• ONETHREAD
  Forces the engine to run on a single thread. Not recommended unless debugging.
• PATHS
  Custom path setup for testing wrangled content (not used for shipping builds).
• PREFERREDPROCESSOR
  Lets you assign Unreal Engine to a specific CPU core/thread.

⚙️ How to Add CLA in Fortnite

To try these settings in Fortnite (which runs on Unreal Engine), follow these steps:

Open the Epic Games Launcher.

Click your profile icon (top-right) and go to Settings.

Scroll down to Fortnite and expand the section.

Check Additional Command Line Arguments.

Add this for a performance boost:

-limitclientticks -LANPLAY -NOSPLASH -USEALLAVAILABLECORES -NOTEXTURESTREAMING

Restart Fortnite.

Using these arguments can give you that extra edge in performance. Just be sure to use only those officially supported by Unreal Engine for best results.

🏷️ Tags: Unreal Engine, Fortnite, Command Line, Game Optimization, Performance Mode, Gaming Tips, Epic Games, PC Tweaks, Texture Streaming, Game Development