How to get better performance with Qt4.5 on arm platform

I just finished porting the QT4.5.3 GUI lib with touchscreen lib tslib1.4.1 to arm9 based S3C2440;but I find programs are running slow.How to make Qt4.5.3 run more smoothly? I have already read the references on http://doc.trolltech.com/4.7-snapshot/fine-tuning-features.html and http://开发者_如何学JAVAdoc.trolltech.com/4.7-snapshot/qt-performance.html Any other suggestion according to your experience?Thanks！

I use the S3C24xx too. I use Qt 4.6.2. Here is my compile configuration

@host:/qt-everywhere-opensource-src-4.6.2#./configure \
-opensource \
-confirm-license \
-release -shared \
-embedded arm \
-xplatform qws/linux-arm-g++ \
-depths 16,18,24 \
-fast \
-optimized-qmake \
-pch \
-qt-sql-sqlite \
-qt-libjpeg \
-qt-zlib \
-qt-libpng \
-qt-freetype \
-little-endian -host-little-endian \
-no-qt3support \
-no-libtiff -no-libmng \
-no-opengl \
-no-mmx -no-sse -no-sse2 \
-no-3dnow \
-no-openssl \
-no-webkit \
-no-qvfb \
-no-phonon \
-no-nis \
-no-opengl \
-no-cups \
-no-glib \
-no-xcursor -no-xfixes -no-xrandr -no-xrender \
-no-separate-debug-info \
-nomake examples -nomake tools -nomake docs \
-qt-mouse-tslib -I/usr/local/tslib/include -L/usr/local/tslib/lib

@host:/qt-everywhere-opensource-src-4.6.2# make
@host:/qt-everywhere-opensource-src-4.6.2# make install

Also notice that, if you change optimization level of compiler in file qt-everywhere-opensource-src-4.6.2/mkspecs/common/g++.conf from -O2 to -O0 may cause the Qt library run very slow. Hope it is useful for you.

I suggest running a profiling tool to see what your program is actually doing. It might be that another part of your program is hogging the CPU. Performance problems are often first noticed through the GUI since it is something that the user sees and interacts with. Oprofile is a good tool to try out.