I have created image app in android studio. There are almost 75 images in drawable resources in android studio. But as the image size is big, the app crashes or images scroll very slow.
To loading the image in application use Glide Image loading library
It will load image asynchronously and efficient way
After if problem persist review ur code and check in android profiler
This sample way how to load images in image view and for example on Glide search in google
GlideApp.with(this).load("url").into(imageView);