Rendered view is faster if I hide curves

I had curves turned off in Rendered mode to speed it up a bit, but it made little impact, but then I noticed that if I hid those curves then it became very much faster. So it seems the rendered view calculates all the curves, it just doesn’t show them, why is that? Could it not work with a separate list of objects that didn’t include curves (just as if curves were hidden) ?

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