I'm seeing an issue with 4.16 also.
It's not the performance, in general, it screams.
But there seems to be some kind of state when issues arise. I have the highest end brand new computer, but occasionally the block downloading seems to start getting behind, and once this happens, it's as if it can't keep up, and gets further behind, every time there is a new block, or something. Can't seem to isolate more info that that, at this time, but I'll keep watching it.
Not in any way complaining, this is all brilliant stuff, just reporting issues in hopes that they might be easier to find and fix.
Oh, and when will the commands to monitor what shares have been voted be fixed. Is there anything I can do to help get them working?