Is it still buggy to restore from backup?

I've heard over the years that this can cause battery/processing issues, but lately when I mention that to people I kinda get eyes rolled at me. What I hear is that this is a pretty minimal process and doesn't mess up the new phone. I'm just wondering about people's experiences/knowledge of this lately. Is it more a philosophical thing than an actual performance problem?

I just got a 128 gig 6S Plus today, have updated the iOS to 9.0.1 and used it as a new phone for a few hours and aside from some minor lag (noticeably when unlocking the phone), it's been great.

The thing is, I have a history of texts that I'd like to save and unlike other parts of the phone (voice memos, etc) there seems to be no way of transferring texts over to a new phone without a full restore. I'm coming from a 32 gig 5S that was at 9.0.1 when backed up via iTunes, encrypted. I'm now restoring that backup to my new 6S and will report how it performs.

 

I deleted most apps from my 5S because I figured a fresh install of my apps would work better anyway, and did a full backup. Then I restored my new 6S Plus from that backup so I could keep my text messages and voice memos, etc. Did this via iTunes on my laptop. 2 days now and it's been working great. The only thing is if the battery is taking a hit from that, I wouldn't know because I don't have normal 6S Plus experience to compare it to!