Let me preface this post by saying, I didn't have an issue dealing with the jerky animations in my 6+. I was happy Safari, which I use the most, no longer crashed several times daily. Last night a member, FoxD mentioned turning on Reduce Transparency. I started messing around with that option and Reduce Motion. I completed the steps below and it helped tremendously!! Some folks have posted that it helped them as well. ***** To be clear, you're turning both these options ON from the iOS 9 default and then turning them OFF. (going back to default) ***** "I might have stumbled upon something that gets rid of most or all of the lag. I have a 6+. I slid the Reduce Transparency slider to ON and messed around with my Apps, Notification Center, etc. I then set Reduce Motion to ON. Same thing, I just tooled around iOS for a bit with both ON. I then set Reduce Motion to OFF and slid Reduce Transparency to OFF and bingo, no more lag!! I've tried everything to get it to lag, pulling down spolight, opening tons of apps in the app switcher. I've seen that the jerky lag before, so I know what it looks like. It's much, much smoother now and dare I say fast! Happy days are here again! Try it out! YMMV."