Website: https://money.pl
In an empty instance of Orion browser, open money.pl website. Once it is loaded (need to wait until it's loaded), open new tab and make that new tab active. After few seconds, money.pl orion browser process will jump to 100% cpu usage (in Activity Monitor) and stay there until the website tab is activated again or closed. This does not happen with Safari, Brave or Vivaldi. Compatibility mode does not change anything.