When discussing the mansions (included or custom) we often add an image of the room(s) we are talking about.  Usually we use the Mac OS feature command-shift-3 or command-shift-4 to make the picture, which will result in a PNG formatted picture.

These pictures take up a lot of space.

If you double-click on the graphical file it will open in Preview.  Then you can save it as gif or jpeg, which both take a lot less space than the original PNG file.

Please allow that little extra time to make this conversion before uploading your pictures to save space in the forums.

Also, please consider whether an image is always needed to make your point about the room in question.  As you attach more images in one post our browsers will take longr time to load them.