Reduce your file size BEFORE you put them on the animation line

This is to reduce the file size for LOTS of files:

Open all the files through Photoshop

Go to Action (if the window is not open go to Window and open 'action')
Click on the box - 'create new action'
Go to Image - Image size - change resolution to 72
and then change the longest length (either width or length) to 1,100 pixels
STOP action - bottom left square

Go to
-File
-Automate
-Batch
-opened files (those you have already put on the Desktop)
-choose your action