When I started using CNC routers I had a tendency to stay slow with all of my feed rates. What I’ve learned over the last three years is that in general I was going too slow for the material I was cutting. The main downsides of going too slow are excessive wear on your bits, subpar cut quality, and the increased time it takes to cut your part.
Pay close attention to the shavings that are coming off of your cut. If you’re generating extremely fine dust then you’re going too slowly. Even MDF will curl in to half-moon shaped slivers when being cut at high enough speeds.
Here’s my suggestion to you. Become familiar with the controls for your machine and learn how to change your feed rate on the fly, while the job is running. This is the best way to find the appropriate feed rate for your material, your bit, and your machine. Pay close attention to the size of the chips that are coming off of your material. This is the best indicator. Get yourself a micrometer and pay attention to the chipload charts from the manufacture of your tool and don’t forget trial and error is always acceptable way to learn. I’ve always learned best by making mistakes.