CRF also gives a more direct result of any settings you changed. Say at CRF 18 (roughly transparent quality) using subme 7 and trellis 0 gives a stream with an average bitrate of ~1500 kbps. If you throw on subme 9 and trellis 2, you'll notice the bitrate will drop down some amount. So that 1500 kbps stream is now only (for arguments sake, don't take this as word for the exact amount it'll drop) 1300 - 1400 kbps.
With 2-pass you can either get higher quality at a bitrate or lower your bitrate to get the same quality, but that's a bit difficult.
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You can't call your encoding speed slow until you start measuring in seconds per frame.
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