It is normal for the use of more than 6gigas of memory, only with the FG in multiplayer?
Running only the FG as time was increasing memory usage, I began with 53% and in the first hour has increased to about 70%, and in the second hour consumption was 89%, it never occurred to me that in previous versions, I had installed the 3.0 version and I can remember working below 70%.
The aircraft used for longer were 748 and 707 (this I used with low memory consumption in version 3.0).
C:\Program Files\FlightGear 3.4.0\bin\fgfs.exe
--fg-root=C:\Program Files\FlightGear 3.4.0\data
--fg-scenery=C:\Users\xxxxxx\Documents\FlightGear\TerraSync;C:\Users\xxxxxx\Documents\FlightGear\Custom Scenery;C:\Program Files\FlightGear 3.4.0\data\Scenery
--terrasync-dir=C:\Users\xxxxx\Documents\FlightGear\TerraSync
--fg-aircraft=C:\Users\xxxxxx\Documents\FlightGear\Aircraft
--airport=SBPA
--aircraft=707
--disable-random-objects
--disable-ai-models
--disable-ai-traffic
--enable-real-weather-fetch
--fog-disable
--bpp=32
--timeofday=noon
--enable-terrasync
--disable-fgcom