This is ridiculous... After updating to 9.0.2 my iPhone 5s is still laggy, especially with the task switcher. Holding it side by side with my friend's iPhone 5 with the same 9.0.2 and the same task switcher open, I can see that her phone works perfectly smooth. Although, obviously, her model is a year older. Introducing random buggy states to their new OS is no good of Apple.
Also, interestingly, you guys seemed to be downgrading back to 8.4.1 almost a week after the downgrade window closed for me here in Austria. I was so eager to downgrade after I noticed all the lags, but no luck...