Hi there. I think I could offer you some help on why this is happening. I am a digital artist and I work with a very powerful computer that I put to it limits. As a reference I increased the memory on one computer to 10 gigabytes of RAM because a similar situation was happening to me and it now works fine.
If you open this 129 mb document on a desktop computer (powerful enough) and it displays fine then the problem is with your iPad's processing power and memory (a limit). And if the document displays errors or blank pages too on a desktop computer the problem may be again the processing power and memory But with the computer used to generate the document. The same PDF program running on a limited computer may bypass some pages or information when it reaches its limits but because the program is somehow efficient it continues to work doing "the best it can".
As a reference, my iPod Touch second gen with 128 mb of memory running iBooks can't even open a complex 12.6 mb PDF full of graphics and iBooks collapses and closes. But my laptop or desktops have no trouble with it.
This problems start to happen when the memory or the video memory reach it limits and the iPad has 512 mb which is adequate for most situations but is not that large. This 512 mb are the active memory for the system and not to be confused with the hard drive's 16 to 64 gigabytes the iPad has for the user movies, apps or files. The 129 mb PDF you are reading is large, but also consider closed documents are smaller in size as they are compressed. The same open document displayed inside the 512 mb memory with every page fully loaded, plus the memory for the program is using, plus the memory for the system and other apps running on the background may be using all the memory the iPad has.
Sometimes just One very complex and demanding page could cause this as the page could contain several layers with a lot of complex drawings, pictures and text. You may think it is only another page but it may demand more memory and processing power too from the system to display the page. But now you may try to navigate back and forth and the system will need to load and maintain in memory a lot more information.
Also a scanned document is a collation of picture files unless you use the OCR conversion. If you have a 100 page scanned document this is equivalent to a 100 page picture magazine or book and not equivalent to a 100 page text book, even if they look very similar to you. It may not be enough to collapse your desktop or laptop this days but it may put your iPad to it limits. Remember the iPad is a powerful but small computer.
Please, if someone else could provide more accurate information it will be nice.
If you open this 129 mb document on a desktop computer (powerful enough) and it displays fine then the problem is with your iPad's processing power and memory (a limit). And if the document displays errors or blank pages too on a desktop computer the problem may be again the processing power and memory But with the computer used to generate the document. The same PDF program running on a limited computer may bypass some pages or information when it reaches its limits but because the program is somehow efficient it continues to work doing "the best it can".
As a reference, my iPod Touch second gen with 128 mb of memory running iBooks can't even open a complex 12.6 mb PDF full of graphics and iBooks collapses and closes. But my laptop or desktops have no trouble with it.
This problems start to happen when the memory or the video memory reach it limits and the iPad has 512 mb which is adequate for most situations but is not that large. This 512 mb are the active memory for the system and not to be confused with the hard drive's 16 to 64 gigabytes the iPad has for the user movies, apps or files. The 129 mb PDF you are reading is large, but also consider closed documents are smaller in size as they are compressed. The same open document displayed inside the 512 mb memory with every page fully loaded, plus the memory for the program is using, plus the memory for the system and other apps running on the background may be using all the memory the iPad has.
Sometimes just One very complex and demanding page could cause this as the page could contain several layers with a lot of complex drawings, pictures and text. You may think it is only another page but it may demand more memory and processing power too from the system to display the page. But now you may try to navigate back and forth and the system will need to load and maintain in memory a lot more information.
Also a scanned document is a collation of picture files unless you use the OCR conversion. If you have a 100 page scanned document this is equivalent to a 100 page picture magazine or book and not equivalent to a 100 page text book, even if they look very similar to you. It may not be enough to collapse your desktop or laptop this days but it may put your iPad to it limits. Remember the iPad is a powerful but small computer.
Please, if someone else could provide more accurate information it will be nice.
