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because when you scrible you only update a litle part of the image and it isn't done in an instant (have a little retard)
normally when you update all the page you go to a process to put all the page to black, and after that put the new image, it's take more time.
(if you see the new implementation of the bionic pdf, you will see that the this change of all the page can be done more fast, but no in the ipdf official (for now))
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