Maybe this will help some.  The game runs slow for me as well in small screen.. I cannot seem to find the full.screen option in PSclient.

During game run, CPU usage caps at 100% pagefile will equal 440 mb or so on this system.

If it would help I would send someone via e-mail the complete dxdiag file, but this details my system.

300k cable modem

DXDIAG Info
------------------
System Information
------------------
Time of this report: 5/27/2003, 14:38:07
Machine name: POS
Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 1 (2600.xpsp2.021108-1929)
Language: English (Regional Setting: English)
System Manufacturer: n/a
System Model: ASUS A7V333 fsb
BIOS: Award Modular BIOS v6.0
Processor: AMD Athlon(TM) XP 2100+,  MMX,  3DNow, ~1.7GHz
Memory: 512MB RAM
Page File: 124MB used, 1126MB available
Windows Dir: C:\\WINDOWS
DirectX Version: DirectX 9.0a (4.09.0000.0901)
DX Setup Parameters: None
DxDiag Version: 5.03.0000.0901 32bit Unicode

------------
DxDiag Notes
------------
  DirectX Files Tab: No problems found.
      Display Tab 1: No problems found.
        Sound Tab 1: No problems found.
          Music Tab: No problems found.
          Input Tab: No problems found.
        Network Tab: No problems found.

--------------------
DirectX Debug Levels
--------------------
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)

---------------
Display Devices
---------------
Card name: RADEON 7000 SERIES  
Manufacturer: ATI Technologies Inc.
Chip type: Radeon 7000 AGP (0x5159)
DAC type: Internal DAC(350MHz)
Device Key: Enum\\PCI\\VEN_1002&DEV_5159&SUBSYS_003A1002&REV_00
Display Memory: 64.0 MB
Current Mode: 1280 x 1024 (32 bit) (60Hz)
Monitor: SyncMaster 760TFT/ 760VTFT/ 780TFT
Monitor Max Res: 1280,1024
Driver Name: ati2dvag.dll
Driver Version: 6.14.0010.6343 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 4/28/2003 22:39:48, 291584 bytes
WHQL Logo\'d: n/a
WHQL Date Stamp: n/a
              VDD: n/a
         Mini VDD: ati2mtag.sys
    Mini VDD Date: 4/28/2003 22:39:24, 625920 bytes
Device Identifier: {D7B71EE2-1219-11CF-756B-3020A1C2CB35}
        Vendor ID: 0x1002
        Device ID: 0x5159
        SubSys ID: 0x003A1002
      Revision ID: 0x0000
      Revision ID: 0x0000
      Video Accel: ModeMPEG2_D ModeMPEG2_C