As requested. These things are also known as 'steam launch options', and there is quite a bit written about them, and apparently quite a bit unknown. Many say they are placebo, but they are so easy to implement I've given them a try and believe they solved some of my issues like screen tearing and fps smoothness.https://community.bistudio.com/wiki/Arma_3_Startup_Parameters
while still in steam:
1) Go to your games library
2) Right click on the ArmaIII library 'shortcut'
3) Select properties
4) Click "Set launch options"
In the window you type or copy/paste sections of code, leaving a space between them, so...
For Hyperthreaded CPU's such as some quad core chips you will enter this:-enableHT
The following code doesn't lock the VRAM; this gets around a Win7 bug where all VRAM is not recognized (seems to be my case as seen on DXDIAG)-d3dNoLock
And these others are self explanatory, mostly. There are many more of these types of settings to explore...-noPause
[really only for SP, as you can't pause in MP anyways]-noSplash -nologs
[this one apparently improves fps significantly for some]-world=empty
[speeds up load time but doesn't affect getting to your server destination]
To include all of the above the following would be entered into that thin window you accessed. Simple eh?-enableHT -d3dNoLock -noPause -noSplash -nologs -world=empty