Not long after FS9 came out folks discovered a small display tweek for the cfg that really helped with FPS. The instructions were simply to replace the display line with [DISPLAY.Device.NVIDIA Drivers on Win2K/XP]. I have had great success with this change and substantial FPS improvements. However I just did a new install of FS9 and after making that change FS9 loads to a black screen and I have to ctrl-alt-delete out. Anyone know why that might be?

All the tweak ends up doing is create a new display section in the FS9.cfg. People were seeing improved fps in some instances because the tweak was changing MSFS from 32 bit mode to 16 bit mode. It's possible that due to your applying the tweak, the FS9.cfg has two conflicting display entries. I suggest deleting the FS9.cfg altogether--let FS9 rebuild it. If you want the same benefit that the tweak offers, you can change manually to 16 bit mode and/or lower your resolution. Both were happening to the users who posted the before/after fs9 display section results. This is one tweak that really isn't needed, in my opinion, once you understand what it was really doing.-John

In the past I am pretty sure I was still in 32bit. Whatever the case is my FPS are half of what they were before the rebuild and I cant figure out why.

Did you reinstall just FS9, or rebuild your entire system? A system rebuild combined with half the performance may be due to a driver issue--most common are the wrong or outdated MB drivers, a problem with video drivers, or a problem with DirectX. If you just reinstalled FS9 and did nothing else, your system may not be using Hardware T&L or may be using a higher res. than you were before. If you just did a MSFS reinstall, search your system for a backup of the fs9.cfg. You may have backed up the original without remembering it--it's such second nature to do it for many of us.-John

I am really scratching my head now. I had done a complete hard drive rebuild followed by replacing all of my FS9 stuff. I had recorded all of my settings (I keep a log of all of them) and I had done plenty of FS9 rebuilds in the past. The only change I made was upgrading Nvidia drivers to the new ones, but I even tried removing those and using the older ones.In the past that one line change in the cfg always made a very noticeable change in FPS on this machine. Now for whatever reason I cant use that little trick. I used to lock my FPS at 40 and with aircraft like the RA Spitfire I would have a steady 39-40 FPS in all conditions and all locations. Now I am lucky to get over 20 with no clouds. More complex aircraft are in the pits and unusable now (well they are usable, but up until a few days ago I got 25-30fps and now I get 10-15 or less).P4 3.2HT, 2gb Ram, 6800GT 256mb, Windows Xp Home

I think I solved the issue.In fs9.cfg I had this line:[DISPLAY.Device.NVIDIA GeForce 6800 GT.0]I replaced it with this:[DISPLAY.Device.NVIDIA Drivers on Win2K/XP]When I would reload Fs9 all was black. I just tried again but before hand I turned off all AF and AA from my video card controls. I had already turned off AA in FS9, but making this change seems to reactivate it. It also sets my resolution back to 800x600x16. I was able to reset resolution to 1280x960x32 and turn AF & AA back on to the normal values in my Nvidia menu. Also seems fine now and my FPS are back where they were.I see no difference in picture quality but the FPS is about double what is was before making that change. What is that little trick doing?BTW here is the link to the thread where I learned this trick.http://forums.avsim.net/dcboard.php?az=sho...ing_type=search

For some reason. the before/after changes didn't appear in your post... -JohnEdit: I accessed your post in moderator edit mode, and saw the change you made. Since HTML was turned on in your original post, it didn'r make the change visible. You made this change:Replaced this line:>DISPLAY.Device.NVIDIA GeForce 6800 GT.0DISPLAY.Device.NVIDIA Drivers on Win2K/XP

Oops had brackets around entries.Before: DISPLAY.Device.NVIDIA GeForce 6800 GT.0Changed to: DISPLAY.Device.NVIDIA Drivers on Win2K/XP

See my reply above...

<>I have a new, very high end rig now with an ATI x850 and don't need the above tweak but I can absolutely confirm that on my old rig with a similar Nvidia card, the above edit made a SUBSTANTIAL positive difference. I have no clue why but it DID.Regards,Jim

has always worked for me too