@cn My kid has my old busted 6, and IIRC, the SE has hardware equivalent to the 6s... once I get my kid upgraded, I'll let you know if it seems acceptable, and if so, yours should be better, I guess.
@bennomatic very good of you.
@bennomatic First update iTunes to 12.8, then “all of a sudden” it knows about an iPhone update 🙃
@cn Indeed. I learned that the hard way. Air 2:- 3Gb via iTunes, on my rather unused Win10 box and slow broadband (alongside gazillions of Windows updates): 3 hours. iPad Pro, tethered to iPhone's 4G: under 10 minutes. iPhone 7: at least an hour over WiFi, because Apple won't let me use MY data allowance to download 1.5Gb of update. Grumpy grump grump.