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Most of the ones that have more than 10 pages, specially CS papers.

Can you link us to one, so we can do independent tests with it, please?

For example the Modula-3 reference manual, 100 pages, when scrolling with the mouse, pages can take more than 1s to render on a i7 system.

With native readers, it is almost instantaneous.

http://www.hpl.hp.com/techreports/Compaq-DEC/SRC-RR-52.pdf

Unable to reproduce on a 2.6GHz Core i7. It's slower than the viewer in Chrome, to be sure, but not to the degree you describe.

https://drive.google.com/file/d/0B0Ne3vac3uJuOTB0Y2owLVN3MzQ

There might be something up with your install--- run away plugin? I read lots of journal articles in FF, many in the 15-30page range with figures, with no problem on an old dual-core iMac.

My install?! As I mentioned, in all computer systems I have access to.

I just get the spinning wheel effect, while the CPU usage scales all the way up, until the whole document is downloaded, processed and finally displayed.

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