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I used FSLTL for some time, it works fine but some liveries are missing and visible traffic may vary depending on user. When flying together with friends it is more pleasant seeing the same traffic. AIG naturally achieves that because traffic is based on flight plans (when users correctly apply periodical updates).
As of 2023/08/15
Remark: AI Manager version 1.2.016 added the « Use reduced Wingspan » option (See Discord).
DO NOT USE IT!
Traffic is often accused to cause simulator lags or stutters… It can be the case depending on too high traffic settings and/or simulator graphic settings but who is suffering such lags/stutters should look if some addons is trying to track too much objects rendered by the simulator.
A good example arise when using JoinFS to fly together with other users using various flight simulators. JoinFS 3.2.17 is periodically tracking ALL MSFS objects (each second). The periodical stutters can easily be observed spawning at KPSP with its 2486 wind turbines!
TheSharedCockpit built his own JoinFS version adding a new setting "Omit Non Flying". The result is excellent and even using a mid computer you can now taxi, takeoff and land at Palm Springs International Airport with no stutters.
EHAM Amsterdam Schipol Airport was another place where we were getting some trouble.
The excellent FlyTampa « Amsterdam Schiphol Airport (EHAM) » scenery gives now better results…