There are many tips here: https://gathering.tweakers.net/forum/list_messages/2096876 but I think the thing that did the trick was simply `powertop —-auto-tune`. I also disabled the wifi in the bios. I ran for a bit with turbo disabled which lowered the consumption a tiny bit and severely limited the peak usage, but it also made the system slow overall. So I enabled it again and now sometimes usage spikes but feels snappy. I’m running Fedora.