On Mar 2, 2007, at 10:46 AM, Trenton Schulz wrote:
I will try to check out the performance issue sometime next week
as I am away for the weekend and report back.
Still planning on doing this.
I said I would do this :)
-- Trenton
Performance on a 1GHz PPC Mac is acceptable (for the 5 minutes I
tried it). It pushes processor usage up to 70%+ when typing fast,
but I don't get significant lag. I suspect it would be problematic
for something much slower than this.
(I don't know about endianness or troubles it might cause. I
didn't notice any problems, though.)
So, I fired up Shark and Quartz Debug to take a look at why things
are so slow when moving around in a math formula. It seems that when
I'm moving around in normal text, the area around the cursor is
updated, which is what I would expect and why moving through normal
text is pretty fast. However, if I move into the area for a math
expression, it seems that the entire text area is updated followed by
the vertical scroll bar. This happens for every single cursor
movement, which I can imagine is why it feels so much slower moving
through a mathematical expression. I'm not familiar with how LyX does
it's drawing, but I would expect that if moving through a math
expression would only update a small area of screen (like in normal
text or footnotes), things should be a bit snappier.
Hope this is helpful to someone. I'm sorry that I don't have any
patches to help, but the time that I can spare for this is rather
limited and I think it precludes me from learning the painting
architecture in any meaningful way.
Good luck,
-- Trenton
