Ok got my new iMac about 6 months ago..seriously hated it and was getting ready to throw it in the box and return it to the apple store. The stupid beach ball always coming up. since yosemite talk about slow you have no idea..it felt like years ago when the first computer came out..loading loading loading get coffee still loading you get the picture. after many many calls to apple care I made a appointment to bring it to the genius bar..but its a 21.5 desktop so I went to box it up and I couldn't carry it ( being 71 its not easy) so I put it back on the desk and downloaded Opera hum that worked...downloaded firefox hum that worked...downloaded chrome hum that worked...well yesterday apple finally released a update and low and behold Safari finally works super fast like it should have from the beginning . Videos didn't play before now everything works..Much happier now but I must say it took them long enough.. They also sent the update for the iPhone and iPad . had wifi problems with that too..but its all fixed now thank God