It seems that apple intentionally slows down old machines every so often. In the fall a series 6 Apple Watch will be released and so apple's watch OS 7 may slow down my fast running series 4 to make it slow like my previous series 2 was and so it would be useless to upgrade and why this time I may just wait till all the bugs and speed problems are resolved. Is anyone else planning on doing likewise this fall? I don't know about you but I plan to keep my series 4 for a long time. No reason to upgrade since its fast, has plenty of memory and does everything I need.