iPhone iOS 8.4.1 to 9.3.2

[C DM]

I don't think you need to post these meaningless words twice in this thread.

Sounds like that would apply quite aptly to what you said.

 

[Beeplance]

A general consensus, or opinion on fundamental usability is usually objective enough. Comments such as yours, however, aren't helpful or informative.

@OP
There's definitely a hiccup or two more in iOS 9 than in iOS 8.4
Is that a show stopper? No, because it doesn't extend beyond SpringBoard. If I had the choice to go back to 8, I would for the appswitcher.
But iOS 9 has some useful features that I use everyday like QuickReply to WhatsApp, attachments in mail, and of course- app support!
What will slow down:
Spotlight Search
Folders Opening
Slight delay when an app launches on tap
Appswitcher

Overall I don't have a clear answer for you! It really is 50/50 depending on what you value in your iOS experience.

For me personally I really like night shift and the over all stability improvements. Less app crashing and better safari experience.

But, the overall system performance has taken a slight hit and the first time you feel the input blocking during animations in and out of apps on the springboard it will probably make you feel sick to your stomach! I kept holding on to hope that they would fix this but I think this is just the way it's going to be because of the force touch on the 6S.

The thing is is that you can't go back. I'd reccomend finding someone with iOS 9 on a 6 and using it for a day and then deciding. I miss the feel of iOS pre iOS 9. The way it was fluid and bouncy is missed. iOS 9 feels robotic and choppy compared to it if you are trying to speed in and out of apps on the springboard. It takes multiple taps to open things because it doesn't allow user input during the fade/spring animations anymore. It has to be 100% over and it leads to a robotic choppy frustrating experience. But some of the new features (low power mode, night shift) are attractive and eventually I got used to waiting for my animations to finish before I could tap apps to open. As you can see I'm still quite peeved they changed this one simple thing and it irritates me badly to this day!

If you want the fastest iPhone 6 then stay where you are! If you want night shift and a little better stability upgrade. That's really what it comes down to.

Somedays I wish I could go back and get the speed but I don't think I could live without night shift! Also to note my battery life has been the same for all iOS versions I've had on my 6. In winter I could eek 7-7:30 hours of usage and now in the summer months I'm back down to 6-6:30 usage. My two cents. Good luck!

And the award for 'Most Comprehensive and Insightful Response' to this thread will be shared between....

 

[newellj]

I have two iPhone 6 phones, one still on 8.4.1, the other upgraded to each version of 9.x. Using them side by side, I do not see any noticeable differences in how they run or their battery runtime.