Hi, is there a way to completely turn off lazy load everywhere?

Yes, search for 'lazy' in the admincp to find the setting.

Lazy loading does offer a substantial performance improvement in embed and image heavy sites, so you may want to reconsider.

I meant everywhere not just in posts. I know of that setting you have mentioned but I believe I'm experiencing the lazy-ness when browsing forum index page and forum grid images show up just as I scroll just enough to see them appear. that's annoying.

That would actually switch it off everywhere I believe. Have you tested this on a default unaltered theme? Also, have you cleared cache once switched off to test this?