the PrintpreviewControl used to be very fast, less than 1 second to show 50 pages. I don't know since when it suddently became very slow. I first thought something wrong in my codes, I tracked history of the changes, and didn't any possible reason which slow down the control. Then I created a test form with the printprewcontrol, which only shows 10 pages with "Hello world!", and it is slow!
what could that happen?