Below is info you asked for: I see same behavior with Macports wine, Darwine 1.0.x and Darwine latest build. My application is a home grown tool that does screen capture 5-15 frames a sec. OS Version: OS X 10.5.7 I am using X that came with Leopard. This is what I see in X about box: XQuartz 2.1.6 (xorg-server 1.4.2-apple33) Graphics card info: NVIDIA GeForce 9400: Chipset Model: NVIDIA GeForce 9400 Type: Display Bus: PCI VRAM (Total): 256 MB Vendor: NVIDIA (0x10de) Device ID: 0x0867 Revision ID: 0x00b1 ROM Revision: 3379 Displays: iMac: Resolution: 1920 x 1200 Depth: 32-Bit Color Core Image: Hardware Accelerated Main Display: Yes Mirror: Off Online: Yes Quartz Extreme: Supported Built-In: Yes Display Connector: Status: No Display Connected Let me know if you need more info. Thanks Joe