And what is your device now? I don’t know about pdf, but the djvu book with 1300 pages, which can be seen in the screenshot, loads for the first time no more than 10 seconds. After loading pages scroll very quickly, and scrolling works instantly and smoothly.
UPD: Just uploaded your book, the first opening took seconds 5. Re-opening is always instant.
The program at the first opening caches the entire book, just for quick work with it later, most of the readers on the PC work on this principle.
IMHO it is more convenient than instant opening the first time, and subsequent brakes with each flipping.
Post has been editedAcrossfy - 10.06.10, 17:12Reason for editing: Update