600dpi is magazine print rez. This should be fine...
your eye wouldnt be able to tell the difference between 600 and 2880!
2880dpi is DEFINATELY overkill
what on earth would print at that res' ????
are your source images 2880???????
hope not.. open them in photoshop if poss and check the dpi
probably find its 72dpi
Screen res ONLY
If you change it to 600 you might find that your image size changes slightly. tweak and photoshop/corel /whatever and test the quality and speed with the test file.
That will answer it for you
hope that helps.
Brad.