i'm getting 15-20FPS on the ground, 30-40FPS on air, really depends on the location. but since there is some add-ons, it lacks it even worse. without sound the fps kinda rises. the POSKY add-on of everything is high-spec. like the 737, 747, and the 777. I think 777 because of the cockpit. I didn't find any reason it should lag. thank you.
I think that even if i had some 3000€ high end PC, it still wouldn't run FSX much better because people say that FSX just isn't optimized for new hardware.
There are a lot o guides on the web. But no guide will be 100% match to your system.
First thing: Buy SteveFX DX10 fixer. It will already tweak a few things with simple button clicks.
Then it is just reading the guides and tweaking, some things might work, somethings might not work. It is trial and error. SOme minor tweaks may even cause a complete crash of your FSX. So keep track what you change.
The thing is, I found FSX:SE much more stable. So if you are still running the DVD version with the service packs, switch to the Steam version.
But in general, to get better FPS, means upgrading or even completely replacing your system.
I switched to P3DV4, I can only recommend it, although a new up-to-date system was required, a costly thing, but in the end you won't regret it. 0 tweaking yet, runs smooth with pretty much everything at max settings. + Your FSX payware is compatible. As most of them have been updated for P3DV4 & 5. So no money loss there.
(I am an ORBX fan, most of my payware is from them)
And then there is offcourse MSFS2020. That will be the standard pretty soon. But that definitely will need an up-to-date system.
Get steves DX10 fixer, it should get you a few more FPS. (The paid version, there are some available via torrent, or at least used to be, but the man spend time creating the tool and should be rewarded, it isn't that expensive either)
https://www.flightsim.com/vbfs/showthre ... king-Guide