Backup-DbaDatabase produces a lot of output, but the one you’re really going to be interested in is Duration. You’re job is going to be to minimise this as much as possible without impacting database performance.
To test changes in isolation you’ll want to remove the biggest variables in backup performance, network and storage speed. To do this, there’s a magical backup device that’s got near infinite speed and storage you can use. This is the black hole known as the bit bucket, /dev/null or NUL:, everything thrown into this pit disappears as fast as it’s put in.
Read the whole thing. And if you’re interested in a systematic method of testing and understanding the impact of these settings on your system, I have a presentation on the topic.