Which set of built-in objects does pd have for measuring the performance of an object
or objects that are not doing any DSP computation?
What about the DSP objects?
How can I find how much CPU each DSP object is using?

Not really answering your question, but recently I found that the most CPU is consumed by the graphic representation, atom bowes with rapidly changing numbers being the worst. (like one number2 box with a constantly changing number, 0-191, in like 3 seconds, over and over would consume about 1/3 of my whole CPU, i7 8th gen.) I use purr data on ubuntu.