In case anybody is experiencing a very consistent spike in frame times on regular intervals, and is also having very long steam startup times; your hostname or loopback-aliases having a hyphen might be the issue, as it was for me.

Try launching steam from the terminal, and if something along the lines of 'src/steamUI/webuitransportcontroller.cpp (206) : Failed to connect to websocket' appears after the ui finishes loading; try to do what is suggested in this thread https://github.com/ValveSoftware/steam-for-linux/issues/10879#issuecomment-2171168395 .

Aside from modifying the aliases of my loopback interfaces in /etc/hosts, I also changed my /etc/hostname file in order to match my hostname with my aliases.