When the newest patch was released, I experienced a slight drop in frame rate, but was able to overcome this by turning off my bump map terrain which was previously enabled.  This was fine, and I enjoyed 60FPS for the rest of the day no problems, and flew fine all weekend.  I downloaded the newest patch today, and without any changes to video settings, I'm hitting 45FPS sitting in the tower with nothing going on around it.  If I look around, it drops to 30FPS.  If I continue to look around, the video memory indicator continues to fill up like it's not dumping data or something.
I'm running 512 shadow, detailed terrain and water, no bumping, no ground clutter, anti aliasing turned off
          Processor: Intel(R) Core(TM)2 CPU          4400  @ 2.00GHz (2 CPUs)
             Memory: 3070MB RAM
          Page File: 441MB used, 10468MB available
        Windows Dir: C:\WINDOWS
    DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
     DxDiag Version: 5.03.2600.5512 32bit Unicode
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DxDiag Notes
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  DirectX Files Tab: No problems found.
      Display Tab 1: No problems found. DirectDraw test results: All tests were successful. Direct3D 7 test results: All tests were successful. Direct3D 8 test results: All tests were successful. Direct3D 9 test results: All tests were successful.
        Sound Tab 1: DirectSound test results: All tests were successful.
          Music Tab: DirectMusic test results: All tests were successful.
          Input Tab: No problems found.
        Network Tab: No problems found. DirectPlay test results: The tests were cancelled before completing.
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DirectX Debug Levels
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Direct3D:    0/4 (n/a)
DirectDraw:  0/4 (retail)
DirectInput: 0/5 (n/a)
DirectMusic: 0/5 (n/a)
DirectPlay:  0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow:  0/6 (retail)
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Display Devices
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        Card name: NVIDIA GeForce GT 220
     Manufacturer: NVIDIA
        Chip type: GeForce GT 220
         DAC type: Integrated RAMDAC
       Device Key: Enum\PCI\VEN_10DE&DEV_0A20&SUBSYS_830F1043&REV_A2
   Display Memory: 1024.0 MB
     Current Mode: 1680 x 1050 (32 bit) (60Hz)
          Monitor: Plug and Play Monitor
  Monitor Max Res: 1600,1200
      Driver Name: nv4_disp.dll
   Driver Version: 6.14.0012.8558 (English)
      DDI Version: 9 (or higher)
Driver Attributes: Final Retail
 Driver Date/Size: 10/7/2011 20:50:00, 4226688 bytes
      WHQL Logo'd: Yes
  WHQL Date Stamp: n/a
              VDD: n/a
         Mini VDD: nv4_mini.sys
    Mini VDD Date: 10/7/2011 20:50:00, 12791488 bytes
Device Identifier: {D7B71E3E-4960-11CF-9D52-03A303C2CB35}
        Vendor ID: 0x10DE
        Device ID: 0x0A20
        SubSys ID: 0x830F1043
      Revision ID: 0x00A2
      Revision ID: 0x00A2
      Video Accel: ModeMPEG2_C ModeMPEG2_D 
 Deinterlace Caps: {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                   {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalSt retch 
                   {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                   {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalSt retch 
                   {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                   {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalSt retch 
                   {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                   {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalSt retch 
         Registry: OK
     DDraw Status: Enabled
       D3D Status: Enabled
       AGP Status: Enabled
DDraw Test Result: All tests were successful.
 D3D7 Test Result: All tests were successful.
 D3D8 Test Result: All tests were successful.
 D3D9 Test Result: All tests were successful.
AH Profile Settings for NVidia Control Panel:
Anisotropic Filtering --Off
Antialiasing/Gamma Correction -- Off
Antialiasing Mode -- Off
Antialiasing Settings -- None
CUDA GPUs -- Use All
Extension Limit -- Off
Maximum Pre-rendered Frames -- 3
Multi-Display/Mixed-gpu acceleration -- Single Display performance mode
Texture Filtering -- Anisotropic sample Optimization -- On
Texture Filtering -- Negative LOD bias -- Allow
Texture Filtering -- Quality -- High Performance
Texture Filtering -- Trilinear optimization -- On
Threaded Optimization -- On
Tripple Buffering -- On
Texture Filtering -- Anisotropic filter optimization -- Off
Vertical Sync -- Force On
[EDIT:]  I tried flying and was getting frame rate drops and frame freezes so severe it was impossible to see what was going on.  This was translating into command inputs being disregarded by the game while the frame was frozen.  Game is pretty much unplayable right now.  I hope you can help out with this.