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I also have the impression that motion blur causes frame drops. Then again, some games do seem to hiccup when turning regardless of if motion blur is enabled.
Now I'm wondering if it's causation or just correlation. Intuition suggests that additional post-processing would at the very least exacerbate frame drops even if it doesn't cause them itself, but I've never done a deep dive to find out.
In my experience it's correlation. Motion blur shouldn't be a particularly expensive operation. Objectively, yes, it will cause some degree of slowdown, just by necessity, but it really does do a decent job of masking those brief FPS hits.
My rig isn't the most up-to-date. I'm also extremely sensitive to a lot of the artifacts that come from not having a consistent FPS. Vsync does a decent job of preventing those issues, but the slowdown dropping from 60 to 30 fps is very jarring to me, no matter how brief, and some light motion blur really smooths it out for me. Now, you can ABSOLUTELY overdo it, and that makes it worse. Usually I use the lowest level available, and the slowdown is preferable to overdone motion blur usually.