Personal Comments
The challenge for us who own low to mid spec PCs is how to get a reasonably immersive traffic environment without overly negative impact to FPS. My solution after trying a whole bunch of options is:
Offline AI Traffic set to 18
Simple Traffic to get proper liveries plus real-world historical routes
VFR Traffic to get small aircraft activity
AIFlow + AIGround to sort out the worst habits of AI taxi, exit, etc.
Use Generic Models to minimize CPU impact
That’s about it, not much else to say. FSLTL is amazing but so hard on fps at a Class 1/2 airport even if I leaned out the IFR/VFR and radius settings.
