We know that iPad 2 performance is higher than the performance of the original iPad (Safari, Games, etc).
But whether iPad 2 user experience is better in opening and reading heavy-weight PDFs than original iPad?
UPDATE: Consider heavy-weight pdf is a magazine or pdf book with a large number of illustrations, so there is almost no scripts, flash, etc — just pure text with links and images (e.g. pdf files about 80Mb).
Best Answer
The iPad 2 is most likely to be faster than the original iPad as it has the newer A5 processor, which is dual-core and faster than it's predecessor, the A4. The iPad 2 also has 512MB RAM, which is 2 times more than the original iPad. This means that the rendering of the images will be faster, and more parts of the PDF can be stored in memory for a longer period of time, ensuring a smooth read.
This article also shows the difference between the speed of the PDF rendering and other factors in a 3rd-party app, but clearly shows that the iPad 2 is definitely faster.