Well, so engraving goes back an forth over the area of whatever you’re engraving If you change every line inside the falcon to score and only engraved the outline, you’d still need to engrave the entire outline, which means back and forth over the whole area of the falcon, the laser just won’t be firing as much.
If you switched to score for everything, sure, it’d be faster drawing those scores, but you’d lose the bulk of your line weight distinction (granted you could get frisky with adding more paths or changing focus by line weight (converting to colors before you go to do so)), but that’s a lot of work, and may or may not be worth it. My gut says you’re going to be in for more than 3 hours of fiddling and testing that way, so unless you’re making a bunch of falcons next week, it’s probably not worth the fiddling time – if it’s even workable.
You’ll still have hot spots at the beginning and end of every score (see my post https://community.glowforge.com/t/super-manual-engraving/15965 for more on that), so I am not sure this idea will get comparable results no matter what you do, currently.