picture in photoshop or what ever photo program you use, do a save as and save it as a LOW QUALITY jpg. You will not see a difference on the puter between a high quality and a low quality but it will load a lot faster.
If you are scanning something like a bullet or ring or coin, crop it down as small as you can in your photo program. The bit size has to be as small as possible. Do not post a picture that is huge!
The first thing to do is adjust the picture the way you want it. Crop it to get only the item you want for posting. Go up and resize it to maybe 4inches or so. Then do a save as and then the low quality thing. When you have saved it, go to the file and left click on it. Click on properties and it will tell you what bit size it is. If it comes up a 100 k or something, you can make it smaller.