Here is a handy guide to the whole Chip Load concept…
You should be producing small/medium sized chips. If your CL is too small (too slow FR or too fast RPM) you will be producing very small chips/sawdust, then you are “rubbing” (also will cause excess heat, burn marks, dulling of bit, etc.). If your CL is too large (too fast FR or too slow RPM) , your chips may be larger, and you may hear the router “bog down”
This, and router bogging down. Recommended DOC for most specified CL is 1x bit diameter. I have seen charts where they recommend to reduce CL by 25% for 2x diameter DOC, and by 50% for 3x diameter DOC. Personally I would not go deeper than 2X diameter per pass. Trochoidal milling is an exception, as you can go full depth per pass using that method, but the time per pass is increased by a lot.
After you do a few cuts at various feeds and speeds, you will develop an ear for what sounds right and what doesn’t. It is normal for the router to slow down a bit in pitch when it goes from a free running no load state to a loaded state.
If the pitch drops too far (it may sound like it is struggling a bit), then you may need to increase the speed using the dial mid-cut (I needed to do this whenever my compressor kicked in during a cut, as the router was on the same circuit. Moving the router to a different circuit solved that issue)