Preview - anti aliasing and text in scanned pdf

hello all,
i have an issue with preview not anti aliasing text in pdf files. to elaborate, take a pdf with text which is selectable and it appears jagged, not anti aliased as in pdfs with text which is treated as an image, i.e. not selectable.
also, sometimes, when scrolling through pages in full screen, the following page has the text anti-aliased as the scroll animation is taking place, i.e. while the previous page is being moved away through the gesture, but once the previous page has disappeared and the new page 'settled in' the smoothing is gone.
smooth text and line art is checked, as is lcd smoothing in general preferences.
any suggestion are much appreciated.
s.

Hi 1ndivisible,
Hmm, that's odd. My type is looking pretty decent out of Illustrator. Can you try a different font or the same font in a new sequence?
Thanks,
Kevin

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