I couldn't find it here. Perhaps you can't disable it but if you can I would love to know how.
My preference is for Notification Centre to open instantly.
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Absolutely, if you are after a snappier mac by saving those precious seconds here and there, I believe the best option is to go into the
System Preferences and turning on
Reduce Motion in the
This makes the Notification Centre slide-in animation instant. I hope that helps you out, it really makes a difference. Definitely, let me know how you get on.