De-glitz OS X
We love the look and feel of OS X, and while some of its animations can help to convey a sense of your position in the system, you may find them
unnecessarily distracting. In various places you can tweak settings to speed up things like the sliding out of dialogs that open or save files. Many settings, like that one, normally have to be changed using Terminal, but a better way for most of us to explore what’s possible is TinkerTool (free, bresink.com).
Further, macOS Sierra offers a new item in its Accessibility pane; Reduce Motion eliminates fussiness when entering features such as Mission Control or Launchpad, say, replacing them with a brief crossfade. On old Macs, in particular those with an integrated graphics processor, enabling Reduce Transparency quells some visual effects, slightly reducing the workload.
TinkerTool offers a simple way to tweak many hidden visual effects in OS X.