Open Steam
Go to Library
Right-click Dead by Daylight
Select Properties
In Launch Options, add: -fullscreen -novid -refresh 144
Open the game
Go to Settings
Set Display Mode to Fullscreen
Set V-Sync to Off
If needed, edit the config file:
Press Win + R
Type %localappdata%
Open DeadByDaylight
Open Saved
Open Config
Open WindowsNoEditor
Open GameUserSettings.ini
Find FrameRateLimit
Set FrameRateLimit=0.000000
Save the file
Right-click the file
Select Properties
Check Read-only if the game keeps resetting it
Disable any GPU control panel frame limit
Disable NVIDIA Max Frame Rate if enabled
Disable AMD Chill if enabled
Disable RTSS frame limit if enabled