Is it worth compressing images before build?

I know Unity compressing images itself so should I bother doing it? If I can save myself 1mb on an image does that change anything or should I just let Unity do all of the work and compress the images by itself?
Thanks

It’s up to you to make sure the import settings are optimal for the target platform. Compressing images correctly allows them to be more easily read by the graphics device of the target platform, greatly speeding up the time it takes to load them.

If you’re making a 2D game or have textures marked as sprites, consider packing them in atlases so you minimize texture switches and reduce the number of textures that have to be loaded.