Launch Command -threads

Tweaking Windows OS

If  you are playing in Windows 10, you can use the registry editor to set the default cpu cycles.

Run the regedit and follow this path;

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\r5apex.exe\PerfOptions

Create the following variable;

Name: CpuPriorityClass
Type: REG_DWORD
Data: 3

Once you add this to your registry, the process will start with "Above Normal" priority.  Values are 0 = Low, 1 = Below Normal, 2 = Normal, 3 = Above Normal, 4 = High, 5 = Real Time.  Never set to Real Time as it is likely to lock up the PC.  Real Time is basically telling the kernel to ignore everything else until the game exits.  Apex is dependent on the other Windows programs getting some attention.

Tweaking Linux OS

If you are using Linux OS, you can set the priority using nice and renice commands. The highest attention is -20 and the least is 19. 

The nice command line is used to start the app, while the renice command is dynamic while the application is running.

I would use the dynamic renice command once the program is up and running. (e.g. # renice -n -10 -u r5apex.exe) the default niceness for this game is zero.