How Can I use Hardware Rendering instead of Software Rendering with QtSDK 4.8.0 on Mac OS X Lion?

 

I was wondering if someone could help me with this.
I have implemented OpenGL-based Qt application.
The same program when run on Windows performs 10 times as fast.
I think the problem is due to software rendering.
Is there anything I need to do to actually get hardware rendering instead of software rendering with QT on Mac?

1. Test Macs : macbook (2009) OS X Snowleopard, macbook (2011) pro OS X Lion, iMac (2011 mid) OS X Lion

2. Xcode 4.2.1 Build 4D502 for OS X Lion
gcc version 4.2.1 (Apple Inc. build 5666)

3. QtSDK 4.8.0
Install dmg : Qt_SDK_Mac64_online_v1_2_en.dmg (QtSDK 4.8.0)
and
Install source code compile : qt-everywhere-opensource-src-4.8.0.tar

./configure -prefix /Users/kyle.lee/QtSDK4.8.0 -arch x86_64 -framework -cocoa -platform macx-g++42 -no-qt3support -debug-and-release -opensource -opengl desktop -graphicssystem opengl -shared
make
sudo make install

4. Test Result (Same Application)
Windows Application Rendering Speed : 1~3 milliseconds
Mac Application Rendering Speed : 100~500 milliseconds

5. Timer
I’m using timer as follows.
QTimer->setInterval(15);

• Set the graphics system as follows.
  main.cpp

a. QApplication::setGraphicsSystem(“opengl”); // error
b. QApplication::setGraphicsSystem(“raster”); // default
c. QApplication::setGraphicsSystem(“x11”); // the same speed as raster
d. QApplication::setGraphicsSystem(“native”); // the same speed as raster

“opengl” setting is crash.
the others setting are same speed as default.