It is the same speed as the 2017 12” MacBook, has a slower SSD, dimmer screen, and gets almost the exact same battery life as the new quad-core base MacBook Pro that is basically the same size and weight. And it costs almost as much as that much more powerful MacBook Pro.
https://www.cnet.com/news/apples-new-macbook-pro-and-air-both-score-high-marks-in-battery-tests/
https://www.cnet.com/news/apples-new-macbook-pro-and-air-both-score-high-marks-in-battery-tests/