Firefox desktop performance is on par with Chromium.
Mate, I don’t know what kind of beast or toaster you have as a machine, but my experience tells me otherwise.
Also Servo is now a project under the Linux Foundation, and likely Mozilla Corp doesn’t have enough employees to contribute to external projects.
Yes, Mozilla fired the entire Servo team and gave their previous CEO a raise during the pandemic. They can still pivot and focus on Firefox instead of whatever other stuff they have been doing.