Presets, flag breakdown, and a builder string for Steam launch options.
Competitive (pro-style)
No mouse accel, all cores, high priority. Set resolution and RAM for your PC.
Full set (example)
Example string: 1440×1080, 15 GB RAM, mouse 0/0/0. Original had -hight — typo, use -high.
Minimum
Only priority and mouse accel off — safe starting point.
-maxMem=12288 -high -USEALLAVAILABLECORES -m mousesspeed 0 -m mouseaccel1 0 -m mouseaccel2 0
In-game mouse speed
UE engine param: fixes in-game «speed». Often set to 0 with acceleration disabled.
-m mousesspeed 0
Mouse accel 1
Disables first mouse acceleration channel in engine. For stable 1:1 feel.
-m mouseaccel1 0
Mouse accel 2
Disables second acceleration channel. Together with accel1 — predictable input.
-m mouseaccel2 0
High process priority
Windows gives the game more CPU time. May smooth FPS drops.
-high
All CPU cores
Unreal uses all logical cores. Standard for multi-core PCs.
-USEALLAVAILABLECORES
Korean rating
Korean rating mode: less blood and gore on screen. Some players find visuals slightly cleaner in combat.
Resolution (resx × resy)
Force resolution on start. Not everyone (depends on fullscreen mode in game).
Memory limit (MB)
How much RAM the UE4 engine allocates. Useful with 16+ GB. Don't exceed free memory.
Leave 2–4 GB for the OS. With 16 GB RAM, 12288–15360 is reasonable.
-maxMem=
malloc=system
Alternative memory allocator. Some players get fewer freezes — try separately.
No splash
Skips splash screen on launch — slightly faster to menu.