HwKeeper
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Clicked edit on my previous message, an error popped up. And this is the theme on one tab, without a background and wide layout. The laptop is, of course, a bit old, but it's impossible to use like this.
504 is a problem with our proxy; .ru is still going through the French proxy for the Russian audience. Right now, a direct route is being tested — if all goes well, the French proxy will no longer be needed, until Roskomnadzor blocks something else.
I also occasionally get 504s specifically on the .ru domain; the same requests on .net work directly without issues.
Regarding the temperature, I'll look into what might be causing the load.