wow,
suddenly FSX runs quite good! I had a 50% performance gain on my AMD Athlon64 4000+ and dual GF 6600GT... with full screen glare disabled I can max out scenery setting and still get nice FPS around 20 (in the waterplane over caribean island intro).
This gives you an idea on how unbelievable crappy FSX was coded in the first place. When I first noticed that my graphic card loadout was on 15-20% running the game on 5-10 fps I couldn't believe my eyes.
The SP is nothing to cheer about, it just moved the game in the direction of where it should have been right from the start performance-wise.
Another example of the more than poor programming style and policy at MS is the installation routine for the SP. Without asking you it assumes you want to use partition C: as temporal storage (I mean - who wouldn't?) and gives out an error if there is less than 1,5 GB of space available. Nevermind the fact I have 12 GB free on the partition where FSX is installed, I actually had to resize C: just for the installation...
I usually work with linux, and when you do that, it gets harder and harder to accept all those really unacceptable weaknesses of windows just to play your games. I am really sick of being locked out of my own computer by an operating system I have to spend money for