2024 all ultra and with FSTL traffic injector.
About 80-90 FPS anywhere.
Maybe fly with the cabin ? Switch it off better.
Changing Variants
Open the Aircraft Selection Menu
Find from the list or Search for the 'A350'
Choose the 'A350-900' or 'A350-1000' aircraft
Select 'Configure' at the bottom left corner of your screen via your mouse or by pressing the shown keybind
Choose the 'Variant' tab at the top
Select 'A350-900 (No Cabin)' or 'A350-1000 (No Cabin)'
Switch to the 'Livery' tab at the top
Choose your desired livery from the list
Select 'Save and Back' at the bottom left corner of your screen via your mouse or by pressing the shown keybind
Now you can return to the Free Flight menu and Start Flight to use the selected Lite (i.e. No Cabin) variant of the iniBuilds A350 Airliner.