Metal, Apple’s groundbreaking graphics technology, accelerates Core Animation and Core Graphics to boost system-level rendering by up to 50 percent, and efficiency by up to 40 percent, resulting in faster. OS X El Capitan improves system performance across your Mac, making many of the things you do every day faster and more responsive. Unfortunately, I can't seem to download it on my new Mac: It gives me a warning 'OS X can't be installed on 'MyNewMac' because the version of macOS is too new.' I know, but don't want to run it, just install on the disk for the older Mac, so I can run it on the early 2009 Mac mini. You must also require a USB 3.0 Drive with at least 16 GB of storage and please ensure you have taken a backup of all the files in your USB 3.0 flash drive as this installation will erase and remove all the files from your flash drive. You really do not require a bootable installer to upgrade macOS or reinstalling the operating system, It only will be useful when you have multiple computers lying around and you need to download and use the installer each time. The command-line installation of macOS would come as savvy mainly for the system administrators. You can then use an External drive or the secondary volume (USB) to install the macOS using it as a startup disk. A bootable installer drive is much more convenient when you’re upgrading a Mac. In order for you to upgrade to El Capitan with a clean installation of macOS, You need to create a bootable macOS El Capitan USB drive.

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