This is not an option lmao: it is part of the KB5094126 update, pushed to all users. There is no GUI to configure it. Reading the article should be required for commenting.

Can you recommend me a good Pixel 7 on eBay? Because some are saying Gen 1, and I don't think that's what I want, right?

Close, but it is for any application starting, not just during boot time. In fact, it probably will not improve boot time at all because during a boot, the CPU is already boosting, so a pre-boost wouldn't change anything. I agree that it isn't exciting (especially considering every other OS already does it), but it is a good thing, even if they are just playing catch up.

Any so called performance increase will be in milliseconds, which nobody will actually notice in real world usage.

All it does is use the CPU more efficiently during boot to speed up boot times. That's it. Yawn....