After playing for a bit, on exit, my CPU remained higher than usual (usual is 2-5%, it was holding 20-50% cpu usage constant). I rebooted (hey, could be a rogue driver or such), but on reboot, it was still high. Process explorer said it was coming from "System". Took a guess (since the only thing under "System" is smss.exe, the session manager) and went to preferences. Switched my window color scheme from classic to standard, then back to classic... and the extra cpu usage went away again. Perhaps something is triggering part of the Aero interface to stay active (even though the scheme menu does not show it as such)?
DxDiag output (truncated slightly, Vista Ultimate x64):
------------------
System Information
------------------
Time of this report: 9/4/2008, 22:51:22
Machine name: ********
Operating System: Windows Vista™ Ultimate (6.0, Build 6001) Service Pack 1 (6001.vistasp1_gdr.080425-1930)
Language: English (Regional Setting: English)
System Manufacturer: Gigabyte Technology Co., Ltd.
System Model: GA-MA770-DS3
BIOS: Award Modular BIOS v6.00PG
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 5400+ (2 CPUs), ~2.8GHz
Memory: 4094MB RAM
Page File: 1294MB used, 7123MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 10
DX Setup Parameters: Not found
DxDiag Version: 6.00.6001.18000 32bit Unicode
------------
DxDiag Notes
------------
Display Tab 1: No problems found.
Sound Tab 1: No problems found.
Sound Tab 2: No problems found.
Sound Tab 3: No problems found.
Input Tab: No problems found.
--------------------
DirectX Debug Levels
--------------------
Direct3D: 0/4 (retail)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (retail)
DirectMusic: 0/5 (retail)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)
---------------
Display Devices
---------------
Card name: ATI Radeon HD 4800 Series
Manufacturer: ATI Technologies Inc.
Chip type: ATI Radeon Graphics Processor (0x9442)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_9442&SUBSYS_05021002&REV_00
Display Memory: 2297 MB
Dedicated Memory: 506 MB
Shared Memory: 1791 MB
Current Mode: 1280 x 1024 (32 bit) (60Hz)
Monitor: ViewSonic VX922
Driver Name: atidxx32,atidxx64.dll,atiumdag,atiumdva,atiumd64.dll,atiumd6a.cap,atitmm64.dll
Driver Version: 7.15.0010.0134 (English)
DDI Version: 10.1
Driver Attributes: Final Retail
Driver Date/Size: 8/1/2008 00:37:41, 1717248 bytes
WHQL Logo'd: Yes
WHQL Date Stamp:
Device Identifier: {D7B71EE2-D702-11CF-E971-0825A1C2CA35}
Vendor ID: 0x1002
Device ID: 0x9442
SubSys ID: 0x05021002
Revision ID: 0x0000
Revision ID: 0x0000
Video Accel: ModeMPEG2_A ModeMPEG2_C
Deinterlace Caps: {6E8329FF-B642-418B-BCF0-BCB6591E255F}: Format(In/Out)
YUY2,YUY2) Frames(Prev/Fwd/Back)
0,0,1) 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_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)
YUY2,YUY2) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
{6E8329FF-B642-418B-BCF0-BCB6591E255F}: Format(In/Out)
UYVY,UYVY) Frames(Prev/Fwd/Back)
0,0,1) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)
UYVY,UYVY) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)
UYVY,UYVY) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
{3C5323C1-6FB7-44F5-9081-056BF2EE449D}: Format(In/Out)
NV12,0x3231564e) Frames(Prev/Fwd/Back)
0,0,2) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{552C0DAD-CCBC-420B-83C8-74943CF9F1A6}: Format(In/Out)
NV12,0x3231564e) Frames(Prev/Fwd/Back)
0,0,2) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive
{6E8329FF-B642-418B-BCF0-BCB6591E255F}: Format(In/Out)
NV12,0x3231564e) Frames(Prev/Fwd/Back)
0,0,1) 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_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)
NV12,0x3231564e) Frames(Prev/Fwd/Back)
0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
DDraw Status: Enabled
D3D Status: Enabled
AGP Status: Enabled
-------------
Sound Devices
-------------
Description: Speakers (Realtek High Definition Audio)
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0888&SUBSYS_1458E601&REV_1000
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: RTKVHD64.sys
Driver Version: 6.00.0001.5683 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 8/12/2008 16:08:40, 1487256 bytes
Other Files:
Driver Provider: Realtek Semiconductor Corp.
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: No, No
I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No
Description: Digital Output Device (HDMI) (2- High Definition Audio Device)
Default Sound Playback: No
Default Voice Playback: No
Hardware ID: HDAUDIO\FUNC_01&VEN_1002&DEV_AA01&SUBSYS_00AA0100&REV_1001
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: HdAudio.sys
Driver Version: 6.00.5840.16387 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 11/2/2006 01:28:10, 273920 bytes
Other Files:
Driver Provider: Microsoft
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: No, No
I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No
Description: Realtek Digital Output (Realtek High Definition Audio)
Default Sound Playback: No
Default Voice Playback: No
Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0888&SUBSYS_1458E601&REV_1000
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: RTKVHD64.sys
Driver Version: 6.00.0001.5683 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 8/12/2008 16:08:40, 1487256 bytes
Other Files:
Driver Provider: Realtek Semiconductor Corp.
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX(tm) 2.0 Listen/Src: No, No
I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No