I think your'e right there. It's hard for me to get motivated enough to make an extra image of lesser quality thus far.The smart plan should be to prepare a seperate image to post up from the raw file , do no sharpening or smoothing until youve cut the size down to what will get shown, then do your sharpening and if all that compression still requires noise reduction do it then.
I tried the 1000 long side thing and didn't see enough of a reason to keep doing it. I'll just trust that if someone is interested enough in the image they will click on it and see it without being so compressed.