There are already "remove all" commands for images. They don't appear on any menu, but are available for assigning to the toolbar and/or hotkeys.
Oh, thanks, I didn't see those. The "Remove all screen shots" command was exactly what I was looking for.
Removing images will not have any impact on how long it takes the program to sort or group a list—that's done using an index.
Maybe not, but it couldn't hurt. Surely, the larger the database, the more time it's going to take to process it in general (even if only for certain operations).
As a test, I made a copy of my main database (which is now 857MB), deleted all screen shots using the command you mentioned, then ran an "Optimize database" from the Tools menu. The file size was cut to 307MB, a savings of 550MB. If nothing else, that would be half a gig less data to copy whenever I back up the database.
I don't think it's necessary to take such a drastic step just yet with my main database, but it's nice to know the option exists.
Aimhere