• If you upgraded your old osx to new and it is now slow. The best thing to try would be to backup your files to an external source, do a full harddrive wipe/format. Then install from scratch.
    Apple provide a really easy way of doing this:
    Reboot with Command and R (Recovery menu)
    Use Disk Utility here to format the drive.
    Enter Recovery Menu again and download the OSX iso over wifi and install it fresh.
    Obviously requires a decent internet connection to obtain the ISO.
    I only suggest this because traditionally, files orphaned by the retired OS can leave their mark.

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