Very slow rederting of PDF files

Keynote rendering of pdf gives amazing quality. However with a PDF which contains scientific data and many line objects it can be very very slow. For example a file which is 500KB can take 11 sec to render.
Exporting from Illustrator to tiff or PSD (150 dpi) usually result in noticable quality reduction, and also takes all the advantage of being able to presernt PDF in the first place.
Is there any simple workaround?
Thanks
Mickey
PB alu 1.67 Mac OS X (10.4.7)

It seems that there a difference between the PDF rendering engine of keynote (which I suspect is the same one of preview) and the one of Adobe. The same PDF could be compressed to a very small file and open in a snap in Acrobat. But for preview it took few second to render. After cutting bits in an out I found the problematic object and remade it. This sloved the problem.
As a side effect I found out that by using Show package content, you can find the pasted PDF and edit it directly with Illustrator, without having to cut and paste or save and insert.

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__________ Information from ESET NOD32 Antivirus, version of virus signature database 3928 (20090311) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com

In article <AbUtl.4166$[email protected]>, Brad Johnson
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>
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From: Test Screen Name [email protected]
Sent: Sunday, August 04, 2013 11:32 AM
To: gunner0490
Subject: I'm not able to open PDF files in Adobe Reader XI.
Re: I'm not able to open PDF files in Adobe Reader XI.
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