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You will probably see a popup that looks like this.
Click the red X in the corner to dismiss. This is a temporary bug in the system.
My answer follows this info request.
After that finishes do a pram reset, this works best if using a USB connected keyboard.
To do a PRAM reset, you need to restart your machine and hold down these 4 keys.
‘Option’, ‘Command (Cloverleaf or Apple)’, ‘R’ and 'P'.
Keep them down until you hear 4 startup chimes.
If you have a wireless keyboard then the procedure is a little bit different.
Use the very same keys but wait until the first chime and immediately press and hold those keys. I recommend getting your fingers ready because timing is critical.
This resets all of the system buses on your computer, USB, FireWire, display, ethernet and your keyboard/mouse/trackpad.
This will correct many faults but not necessarily yours.
Do that, I think you will see a marked improvement in the system performance. If not then please get back to me and tell me so.