Peter Kümmel wrote:
Here more numbers, with this setup:

MSVC8
Qt 4.1.2 release

Please update to 4.1.3. There are some nice drawing optimization there. Most noticeably for Mac and Linux but I've seen improvment on WinXP also.

So optimizing the text drawing functions couldn't
more than doubling the speed.

Does anybody has an idea why it is still so slow when
all QLPainter functions are disabled? Is it still
a Qt4 problem, maybe because of the scrolling, or
is it a lyx-core "problem".

In the qt4 frontend, if you disable the QLPainter, what is left is the QPixmap drawing on screen. You can not optimize that.

A profiler would be very useful now, could valgrind
be used for profiling?

gprof is the tool to use you are looking for. Isn't there a profiler winthin MSVC2005 express?

Abdel.

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