I was able to check out some speeds on my CS17 with my Honda 5 hp motor. Nothing scientific here, just using my Navionics app with a few throttle levels.
With the throttle at “start” position the app speedometer showed about 5+ mph. Increasing from “start” to half way to full moved the speed to just over 7 mph. There wasn’t much more speed increase when when I went all the way to full throttle… reaching about 8 or so mph. But, that is sufficient for me to get away from or back to a dock. I’d think it would be enough to get to a fishing spot on a lake.
As mentioned, I mount my motor on the bracket that came on the boat. The motor is angled back from vertical and the prop is just low enough in the water (it works well enough for my purposes.) I would think that a better motor placement would improve performance somewhat. My boat might be a little heavier than yours since it is the version with a cabin. And, as mentioned, the 5 hp motor has a more comfortable sound to my ears than that of my 2.3 hp.
Hope this helps.