Maya Animation Tips - The Retime Tool for Graph Editor Curves. A great tool that Autodesk introduced sometime around 2014 is the Retime Tool. This tool sets up "checkpoints" to make it wildly simple to do broad curve adjustments without having to fiddle with keys themselves.
Warning: For those with high levels of OCD and need their keys to sit on whole frames. You may need to brace yourself.⠀⠀⠀