Hi
As Borate mentions, 3000 is a lot of images, however BEFORE you try loading them click the options tab and set the default image display time to 0.1 seconds (or a similar short interval to achieve your time lapse effect.) otherwise each will display for the default time (5 seconds). If you dont do this before you load the images you will either have to start again or change each one individually whilst in Storyboad mode.
Also, if your images are numbered....then I think they will come up in the list as 1,10,11,12,13,14,15,16,17,18,19,2,20,21 etc.
i.e. selecting them all and placing on the sequence line in one go will put the images 2-9 in the wrong place. You will have to drag 1 first, then 10-19 then 2 then 20-29 etc. .......and remember also to set the default (under Options) to place them onto the end of the sequence.
Anyway you can try our hints and see what you get.
Nat