If you often finds yourself reading manga chapters online, then this should be an instant install for you! Here's why:
Near-instant page turns (just take your time reading first 1-2 pages), down from previously up to 4 seconds for me (from europe, at 'peak hours' on popular readers like mangafox).
Also the script preloads between chapters and/or volumes perfectly so you don't lose any time!
It absolutely changes the reading experience, since time spent waiting for page to load can become relatively important when munching chapters, when an average shounen manga page is read in 4-5 seconds, over time you can end up wasting near 50% of the time spent reading waiting for images to load...but no more with this script!