Yes It is very strange..
Hello,
I'am on Apple for about 10 years after a large period on Win.
At Home, I've 3 Apple's computers.( iMac17" - MacBook 13" - iMac 21.5" )
I've bought my new iMac ( 21.5" with 16Go Ram ) in 2014, thinking that I will be quiet with a device like this.
Before, I had a 20" which was good, with any problem, but I wanted to change it.
From the beginning, with my 21.5", I had many issues.
I had to reinstall Yosemite 3 times with the help of Apple's team ( I've got an Applecare ) after clean install.
At each time many problems with Bluetooth, Wifi, black screen, freezed screen,lags, internet very slow, crashes, etc...
My computer hardware have been tested and all was OK. I'm OK also with it, very care of my device.
But all was wrong during 1 year ( and I wasn't alone in this case ).
One year with daily issues, one , two and more per day.
All was done ( for me )....
One week ago, I decided to test El Capitan after making a saving of my documents on an DDE.
I've partitioned my HDD ( 1Go in 2 x 0.5Go). On the first part, Yosemite is staying, on the second, I've install El Capitan always after a clean install.
And then...What a miracle... All is wonderful, speed for all my applications, no lags, Wifi and bluetooth marvelous... For me it's like a dream! And it is only a beta!!!
My computer is open 24h/24h and it runs beautifully.
It is really very Strange ... Why, I don't know.
GGERARD