For a very limited set of conditions, yes.
Reading doesn't normally involve parity, so no benefit for read speeds. Writing is limited by the slower of either the target data disk or parity, whichever is slower, so no benefit for a single write. However, if you are trying to write to 2 different data disks at the same time, parity must shuffle back and forth to service both data disk writes, so in that case, a faster parity drive could make a small difference.
I wouldn't make the speed of the parity drive a deciding factor, other than to not be significantly slower. You would notice much more day to day performance difference by making your fastest drive be the data drive that's used most often, as read speeds are purely limited by the speed of that drive.
Much of the performance optimization discussions will be highly dependant on your exact use case, Unraid has an incredibly diverse array of possible uses that any single recommendation is not likely to be best for you personally.
If you lay out your exact daily interactions with Unraid you may get some good advice on best performance, but from your first post to this thread, I'm thinking you don't even know exactly how you plan on using it.