Then are you saying all the performance degradation/battery issue reported here with ios11 on older hardware are ALL FAKE NEWS?? Wow, talk about FUD.
Then you have to be more clear what circumstances when the lag occurred (esp those reported in the forum). If you keep installing apps or install some background hogging apps or you clogged your internal SD or never reboot your phone for months, the slowdown is inevitable. Do a reset and get rid of all your unused apps or run your Android like an Iphone (go into Developer options and set "Dont keep activities") and I bet the phone will not be laggy.
My Note 5 does not lag due to fact that my family member using it only install apps that are being used. Go choke your iphone with many unnecessary background enabled apps and see how it does. As the video I showed proved that an S7 is capable of not laggy next to 6s (after 2 years with newer firmware). Granted on certain usage patterns (with various different apps/firmware) s7 may lag. Same can be said about 6s or any other phones. There are so many variables in play. But what is conclusive is the s7 can perform faster then 6s (after couple years have passed) - based on the conditions the speed test was carried out.
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I dont have s7 but I have note 5. They are from same era. My Note5 does not lag. Here you have to be discerning what is "lag". If you compare s7 with newer s8 then of course s7 "lag". Hardware is different.