[techknight]

In Windows it's still faster than anything else if you've copied an image to clipboard to open irfanview -> paste -> save, or to do a quick crop or whatever.

[Leftium]

Directory Opus is a little faster:

CTRL-P pastes anything (image, text; not sure what else) in clipboard to a file in current directory

[verstandhandel]

or just the batch mode ... very helpful and fast.

[t0bia_s]

Win + Shift + S

[respondo2134]

for those increasingly rare times you want to print an image it's great too.