Make sure you don't have any limiters turned on in the GX Control sidebar panel.
Make sure you have "Snooze inactive tabs to save memory" disabled at the URL opera://settings/userInterface.
Make sure you have the battery saver disabled at the URL opera://settings/batterySaver.
Make sure you have the flag at the URL opera://flags/#calculate-native-win-occlusion disabled.
Make sure you have https://chrome.google.com/webstore/detail/disable-automatic-tab-dis/dnhngfnfolbmhgealdpolmhimnoliiok installed.
