It's called "Noodle Curving". It can be found in Preferences > Themes > Node Editor:


what happens is when I add the denoiser to the render layer in compositor ,it hangs my laptop for roughly the same amount of time it would take for Blender to do it if was during rendering so it is not clearly working as I asked people they told me that this is supposed to be faster solution. That's not exactly how it works. It doesn't actually make the ...


This is silly but it's also instant, built-in and easy unlike the other answers. Downside is you're limited to one short line. Simply set the 'Label' property of the node you're commenting.

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