Board Thread:Support Requests - Designing Your Wiki/@comment-35289850-20200818165331/@comment-168424-20200818171637

Compression is often related to the complexity of the image. Without seeing the image it is hard to give advice.

Preview on Mac and things like Photoshop usually have a compression control slider that you can get an image to as small as you want with a sacrifice of quality. I could try to shrink the size for you, but you can't expect the quality to stay high.