#Sierra
Since the Launch of Mac System X back in 2001 there have been a lot of updates and new features on each new system.
But what is amazing is that a person who says i Know mac has No clue as to what he is talking about. The Current system El-Capitan which was upgraded to macOS Sierra has 60 new features.
In each new upgrade there has been at least 60 - 100 new features per update. Now I ask you even with the updates to Adobe and other third party applications.
What is important and having been using Apple for the Past 30 years it is vital that you update to the latest that is available daily. As Public Beta Tester for Apple and running a full working system..
Specs, iMac 10.12.1 Beta (16B2548a); (Retina 5K, 27-inch, Mid 2015); 3,3 GHz Intel Core i5; 32 GB 1600 MHz DDR3; AMD Radeon R9 M290 2048 MB. Running full Adobe Cloud Suite as well as other 3 party plugins for Photoshop and Suitcase Fusion 6 to manage my fonts. I have had a minor issues with fonts but found due to the fact that i have over 1 million fonts a few clashed with System. but by reducing and managing these fonts with the assistance of Font Doctor i have dealt with this.
Is you system slow, this could be that you are using Font book and not Suitcase to manage your Fonts or CleanMyMac to manage your system on a daily basis. Alternatively one should have or upgrade Hard Drive to Fusion or SSD and or add add additional RAM which is always a good idea.
Even if none of these have been upgraded using Mission Control to open applications on a new desktop without having apps behind apps etc. does make a person much more efficient, therefore will make you faster. Being tidy and knowing where your organized backup are this will also add to your speed. Most important is being careful and slow as fast seams to incur errors.