I'm experimenting now with going from series-reverb and parallel-delays back to both in series. I typically had a parallel delay with one more shunt, before. After adjusting my patches back to both of these in series, I gained about 2-3% CPU back, on average. So far, the delays still sound good, to me, although I haven't got any stage time with them, yet.
The Delays are maybe a bit more "pronounced", for lack of a better definition, so I've dialed the delay Mix % back a bit, typically, on most of my patches, when in series. Overall, though they sound pretty good, still, and still provide a defined note, which was why I had put them in parallel to start with (to combine a dry signal with the delayed signal, originally).