I’m relatively new to CNC but this post here was incredibly helpful. Keep in mind you are balancing multiple factors here: the RPMs, which is how fast the tool is revolving, how many cutting edges on the tool (ex. 1 cutting edge vs 2 cutting edges is the difference between 16,000 revolutions and 32,000 effective revolutions and cuts), the depth of cut DOC/ depth of pass DOP = how deep the cut will be on each pass (if your machine isn’t stiff enough and the DOC is too deep the gantry will flex and cause the tool to cut at a slight angle), and your speed i.e. how fast the machine is moving the Dewalt across your work surface.
I suggest taking some time to understand how all these factors balance together when cutting or you’ll end up breaking bits, ruining material and wearing out your machines. The CNC Calculator spreadsheet is my preferred reference.