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Old 04-17-2012, 09:33 AM   #1
dead115
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Unhappy Icarus eXcel (M92) and PDFs

When I bought Icarus eXcel (M92 rebrand, launched on 2012, 800 Mhz processor), I thought it would be much faster than my old Kindle DX (bought on 2010, 532 Mhz processor). However, it's exactly the opposite: PDF files take more time to be loaded, and eXcel is slower when changing (refreshing) pages.

For instance, a 7.8 Mb PDF (scanned pages, 300 dpi, b&w, landscape view) takes full 3 seconds to refresh a new page. Kindle DX takes a bit more than 1 second to do the same job.

Why?
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Old 04-17-2012, 10:07 AM   #2
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I have a Kindle 4 NT and I don't see a considerable difference in page turning speed of pdfs compared to my Onyx M92. I have tried only text-based pdfs on my Kindle, however.
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Old 04-17-2012, 02:07 PM   #3
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dead115,
can you upload the PDF?
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Old 04-17-2012, 06:42 PM   #4
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Quote:
Originally Posted by slex View Post
I have a Kindle 4 NT and I don't see a considerable difference in page turning speed of pdfs compared to my Onyx M92. I have tried only text-based pdfs on my Kindle, however.
You're right, both have a refresh rate almost identical for text-based PDFs. However, for files based on scanned pages (300 dpi resolution), the situation changes drastically.

I hope my device is not defective.
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Old 04-17-2012, 07:28 PM   #5
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Quote:
Originally Posted by Defenderland View Post
dead115,
can you upload the PDF?
Yes. Thank you, Defenderland.

Here's that specific PDF I mentioned, around 8 Mb in size. Unfortunately, I have the same problem with any of my files based on scanned pages.
Attached Files
File Type: pdf Administrativo - Mazza.pdf (7.66 MB, 275 views)
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Old 04-17-2012, 07:47 PM   #6
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Same speed here (2,7 - 3,2 s).
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Old 04-17-2012, 09:01 PM   #7
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Quote:
Originally Posted by Defenderland View Post
Same speed here (2,7 - 3,2 s).
Here's a video.
Kindle DX and Icarus eXcel side by side.
Same PDF, same page.
Completely different refresh rate.
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File Type: avi Kindle DX and Icarus eXcel.avi (1.57 MB, 1165 views)
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Old 04-18-2012, 03:15 AM   #8
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Looks like page turning on kindle is super-optimized.
There is an option in M92 to not refresh after every page turn.
Can you try out that option ?
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Old 04-18-2012, 10:11 AM   #9
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Quote:
Originally Posted by Defenderland View Post
Same speed here (2,7 - 3,2 s).
I get page turn speed of < 2 seconds - somewhat faster than the M92 on the video but not as fast as the Kindle.

I get faster page turns with the djvu version of the file. I upload it for you to test and compare. In my opinion scanned books are better in djvu format.
Attached Files
File Type: zip Administrativo - Mazza.djvu.zip (4.87 MB, 120 views)
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Old 04-18-2012, 03:00 PM   #10
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Quote:
Originally Posted by maindoor View Post
Looks like page turning on kindle is super-optimized.
There is an option in M92 to not refresh after every page turn.
Can you try out that option ?
I set "screen update" option to refresh after 9 pages, but there isn't any noticeable change in refresh rates.
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Old 04-18-2012, 04:29 PM   #11
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Quote:
Originally Posted by dead115 View Post
I set "screen update" option to refresh after 9 pages, but there isn't any noticeable change in refresh rates.
This option serves the purpose to save battery power rather than gaining speed.
If you consider how an E-Ink display works (there's an explanation in the mobileread wiki), you can figure that there's a difference in power needed
- to update parts of the screen
- to update the whole screen, accepting visible artifacts
- to reset the whole screen to avoid artifacts.
This option sets the frequency to do the latter.

If changing this setting makes any difference in speed, I'd reckon it is in a completely different order of magnitude (much smaller than what you're looking for).
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Old 04-18-2012, 07:29 PM   #12
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Thumbs up

Quote:
Originally Posted by slex View Post
I get page turn speed of < 2 seconds - somewhat faster than the M92 on the video but not as fast as the Kindle.

I get faster page turns with the djvu version of the file. I upload it for you to test and compare. In my opinion scanned books are better in djvu format.
Amazing!
It works much better than the original PDF.
Decent refresh rate.
Thanks a lot.
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Old 04-18-2012, 07:32 PM   #13
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Quote:
Originally Posted by kodomo View Post
This option serves the purpose to save battery power rather than gaining speed.
If you consider how an E-Ink display works (there's an explanation in the mobileread wiki), you can figure that there's a difference in power needed
- to update parts of the screen
- to update the whole screen, accepting visible artifacts
- to reset the whole screen to avoid artifacts.
This option sets the frequency to do the latter.

If changing this setting makes any difference in speed, I'd reckon it is in a completely different order of magnitude (much smaller than what you're looking for).
Thanks, Kodomo.
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Old 04-19-2012, 07:55 AM   #14
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Originally Posted by dead115 View Post
Amazing!
It works much better than the original PDF.
Decent refresh rate.
Thanks a lot.

But then I see that some tools are not available for DJVUs in eXcel/M92.
Glyph embolden, for exemple.

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Old 04-19-2012, 08:17 AM   #15
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Icarus eXcel is newer than Kindle DX and has a better processor. Why does it take so long to refresh a new page when dealing with PDF files?

On the other side, DJVUs files have a very good refresh rate.

Could that be a software issue?
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