Safari causing excessive battery drain on MacBook Pro

My MacBook Pro (Apple M2 Pro, Sequoia 15.7) has had really bad battery performance recently (I haven't updated software in the last month or made any other obvious changes that would precipitate this). Using Activity Monitor, I realized that Safari is really burning through energy:

This is the case when Safari is simply open in the background (no windows open). The energy impact is huge even compared to Chrome (where I have tens of tabs open, including one streaming video). Any ideas what might be wrong with Safari?