So far as I know, the only odd thing about picture posting is that if you do it from an Apple product (Mac, iPhone, etc) you can post only one pic at a time, and they tend to come out sideways. From a Windows platform, that doesn't happen. Don't know about Android.
Are you sure the delay doesn't come from Photobucket, rather than the forum software? I've never heard of a 120-second delay from anyone here. I myself have posted dozens of photos, sometimes 5 at a time followed immediately by more. But sadly, Photobucket does strange things, such as deleting your photos at some unannounced time in the future, leaving your post with a dead link.
Bill