Hi Hnevmir,
These are my experiences with your files.
The first and 2nd document seem to contain scanned images of the book. As you can read in other threads on this forum, the DR1000 is not good at that.
The first takes a long time to load, but then doesn't display anything... so this is clearly not acceptable.
The 2nd loading takes about a minute and turning pages also takes ages (> 5 sec) when quikcly turning pages, but the reader seems to render some next pages in the background, so after reading the 1st page the next page is quickly shown (~3sec)
So this might be reasonable. Maybe reducing the resolution of the scanned images might improve performance.
Although .. now that I am playing a little bit with the document (jumping to pages) it also seems to crash... could be that the reader is in al instable state after the crash of the first document
The third sample however contains text only (hence its small size) and load in less then 10 seconds using the default reader. Turning pages takes two to three seconds. Also jumping to other pages is very quick. I consider this a good speed to read/use books.
I am using the DR1000 to read magazines like Better Software and DrDobbs as pdf-files. This functions pretty well, although some pages take 'ages' (> 5sec) to display and starting-up a pdf also takes considerable time. But it allows me to use my time to travel to work by train usefull.