My wife has a 6 month old Air with upgraded specs. If a computer has a weak point, she will find it, and in this case it is Safari, and I am de facto tech support. She is a heavy internet user and frequently Safari will simply stop playing videos (YouTube, BandCamp, everything). I can take the same URL, drop it in Chrome, and it plays immediately, so to me that rules out WiFi connection, bandwidth, etc. Is Safari just a crap browser and she should switch permanently to Chrome? FWIW my 2014 Macbook Pro has none of the same issues. I use Safari 99% of the time except when I run into a site I need to use that has issues, but that is very rare. She does have a few tabs open (6 maybe?) and maybe rebooting would sort it out, but she's not fan of that solution and I don't blame her. This computer/OS combo feels not really up to Apple standards.