Performance of single images vs large file?

[Aoide]

Which is better performance-wise: loading several individual images as displayables or loading all the images from a single file and using LiveCrop to make the individual displayables?

For example:

Code: Select all

image bg 1 = "bg1.jpg"
image bg 2 = "bg2.jpg"

vs:

Code: Select all

image bg 1 = LiveCrop((0, 0, 300, 300), "all_bgs.jpg")
image bg 2 = LiveCrop((300, 300, 300, 300), "all_bgs.jpg")

Also: does it make a difference if the images are used as part of a dynamic displayable?

[SundownKid]

I haven't noticed any loading times period in any Renpy game I've played, so I kind of doubt that kind of nit-picking is necessary. Making everything separate images will be fine.

[nyaatrap]

If you use im.Crop (and other im manipulators), it becomes certainly slow and takes more RAM usage.
On the other hand, LiveCrop is a same operation to Transform. In my test, the above codes work in the same performance.