... could this board fix any other motherboard/CPU issues for example memory access which might be effecting the Cybervision operation?
Hmm... That depends on if the problem was in your 3640 card, to begin with... As far as I know, the Cyberstorm 060 mk1 should behave similiar to a 3640 in most circumstances. I don't know of any specific patches on the card that address zorro bus issues. So, if it's your 3640 card that is causing the problem, the problem will go away when you install the CS. If it was a timing issue, the problem might go away, as the 50mhz CyberStorm is a little more timing-friendly than the original 3640. But, if your original problem was caused by something else, then the card may not help it.
What sort of speed increase could this give me over the 040? In real terms what sort of improvement would the card make?
The benchmarks say you should get about 2.5x performance boost. The "feel" of the computer will be improved by AT LEAST this much, in my opinion. The Amiga will surely act much more crisp and responsive in all tasks. I went from a 3640 to a CyberStorm Mk2, and was AMAZED at how FAAAST my Amiga suddenly became.