I created an account just to +1 this issue. Not respecting the requireInteraction: true flag would be one thing, but not displaying the push at all is very undesirable behavior, and Opera Mac is the only browser displaying this shortcoming.
It's actually fairly decent. The two apps that I use that take a toll on the GPU would be Darktable and Gimp, both with OpenCL support enabled. Neither cause any serious temp or load increases.
I did have loud fan noise and very high CPU temps at first (this is a new laptop, only 2 weeks old) with RetroArch and VirtualBox (with a Windows 10 VM), but for both, I was able to find settings that I disabled to completely eliminate the problems.
In RetroArch, it was the "Hard GPU sync" setting, which synchronizes the CPU and GPU. In VirtualBox, it was "Enable PAE/NX".
I will see if I can disable the Intel graphics chip in BIOS.
cCleaner could clean your recent visited sites too.
You need a Sceen Recorder and then convert the video to Gif.
Click on you avatar - then in name, in top right case -, click on the 3 vertical dots, Topics/Posts.
@graveyardgirl there is an opera add-on, site settings sidebar. setting plugin+NPAPI plugin to allow (pop-up too if needed) enabled the flash and i could display any flash content without problems. you set this once on any desired website, and opoen it in a new tab, it saves that setting and will always display the flash content without having to click to play.
also there is another workaround, https://forums.opera.com/topic/23326/flash-player-does-not-work-can-not-be-able/80
maybe one of these options will work for you. I know it's not a complete solution, but it's decent enough workarounds.
In addition: Win 8.1 Opera 49.0.2725.47 icon on the push not displayed http://prntscr.com/hge2i7
Improvement. May be it'll be better to open new tab after click on push instead opening new opera window? Or this parameter can be changed somewhere?