What the **** is happening with Apple quality control it reminds me the old Windows era that every week you needed a format.
Pass, potentially it could be this specific Mac, equally I don't see how. This 2014 13" rMBP was best put as a disaster on 10.11
First install or 10.11 was an upgrade of 10.10.5, basically
failed due to Apple`s Mail crashing & deleting SMTP settings unable to restore without hard boot, followed by more of the same, duplication of mail accounts. Basically the application was in an unusable state. Accounts are MS Exchange, MS Outlook, Google, iCloud. Preview consuming enormous amounts of RAM to the point of slowing the application, in time the system. AirDrop total failure. General reduction of UI perforce over 10.10.5, felt rather like the whole OS was breaking. System Preferences extremely slow to open, Dock icon would bounce for 10-15 seconds, double booting. Many other small random issues (10.11.1 resolved specific issues with the
Installer, Mail & Preview and of course most importantly more emojis
)
Subsequent installs of 10.11.1 were clean, no Migration Assistant, no Time Machine, SSD wiped clean;
failed Safari unable to install extensions, Preview behaviour unstable crashing etc. network performance significantly diminished over Wi-Fi, same issue as above with System Preferences. Mail very slow unsure if related to network performance or the application, seemed to be continuously downloading content. At this point I simply stopped...
I tried two clean installs the second with no third party applications, extensions etc. same 10.11 installer upgraded my daughters Early 2011 15" MBP with no apparent issue, equally her usage is very different to mine, as the system was mine the software package is basically the same. If I had to put it simply;
Installing El Capitan 10.11 is currently a "crapshoot" it may or may not work, based on your hardware/software. If you choose to proceed ensure that the system is fully backed up and not solely with Time Machine, or it may well get ugly fast.
Hardware 2014 13" rMBP 2.8Ghz, 512 SSD, 8GB RAM - stock Apple system has exhibited zero issues (12 months) prior to 10.11 and is employed in an engineering role seeing significant usage globally.
Rolled back to 10.10.5 on a clean install for no other reason than to validate hardware & software load, zero issues, which speaks volumes as all the issues indicated above with 10.11 are all related solely to Apple...
Q-6