Somewhere between ios9 and 10.3 on an iphone6 things got noticably slower e.g. pauses lasting multiple seconds while doing things like scrolling. I suspected th

Somewhere between ios9 and 10.3 on an iphone6 things got noticably slower e.g. pauses lasting multiple seconds while doing things like scrolling. I suspected the filesystem update, but could be anything. Apple are forward looking in development - meaning they don't seem to be doing much regression testing for things like performance with last years model - or if they are, they don't care. I'm not letting ios11 anywhere near my phone based on the usability impact I've seen on others, which leaves me open to old security vulnerabilities. Microsoft security patch old operating system versions - its kinda ironic how the 2 companies have switched places.