So, without further ado, here is the conclusion about filtering in FSX:
Without much searching the forums, since I didn’t know where to look really, I noticed the FPS drop also in the middle of Atlantic, without clear weather. So with a bit of luck, I decided it must be water textures, and only ones I had installed were from REX.
I went poking around in the program, trying out different textures, with no avail. Then I saw on the setup page 32bit vs DXT1, and said to myself, fine, let’s try it. And voila:
No more FPS drop with both filterings. But there is also graphical difference between the two.
I came to this conclusion myself, but also martin-w (thank you) posted that this issue has been recognized previously on the REX forums, so together with that, I am calmed down, that it’s not my computer only.
This is a help for many simmers out there, when configuring their sim, especially since MANY simmers use REX, and I believe many will come into this problem, without really knowing what is causing it. Well, now you know. It’s simply a combo of factors.
REX 32bit water textures + Anisotropic Filtering in NI = NOT OK
REX 32bit water textures + Anisotropic Filtering in FSX = OK
REX DXT1 water textures + Anisotropic Filtering in NI = OK
REX DXT1 water textures + Anisotropic Filtering in FSX = OK
NI = Nvidia Inspector
Also important, something someone was asking me before in the thread:
Anisotropic Filtering in FSX has no impact on FSX if you set Nvidia Inspector (Anisotropic filtering mode) to User Defined/Off and add 16x filtering in the next row. Nvidia Inspector takes over your setting in the FSX (be that aniso or trilinear). Only when you set Nvidia Inspector to Application Controlled, does the setting in FSX take over and then you have filtering via FSX. Unfortunately, I have not found a way to combine the two, like it’s possible with Antialiasing.
I hope this helps some of you at chasing smooth gameplay, since this problem has gave me an aggrevation for quite some time, since I have been using 32bit water textures, since like forever.