Usually I apply #iOS updates promptly. This time, though, I’m looking at my iPhone 6 becoming 40% slower: https://melv1n.com/iphone-performance-benchmarks-after-spectre-update/
It feels like the end of summer when I have to reconcile myself to the fact that there won’t be any more beach days.
Obviously, different SE techniques will yield different numbers, but I haven’t seen any attempt to disentangle SE’s effects from those of caching. In the history of commercial microprocessors, SE and caching have tended to increase in parallel.