4 added 261 characters in body; added 187 characters in body
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Edit3: It's back to 80%, without me opening a terminal. That's so weird, it's been at ~10% for 10-15 minutes now. I didn't open a new app or anything. Didn't start a new process either. I'm just browsing stackexchange on firefox that's pretty much it.

Edit4: Just closed telegram messenger. It went back to 10% for a minute, then back to 80%. Within that minute I didn't use the computer at all, I just watched the process monitor.

Edit3: It's back to 80%, without me opening a terminal. That's so weird, it's been at ~10% for 10-15 minutes now. I didn't open a new app or anything. Didn't start a new process either. I'm just browsing stackexchange on firefox that's pretty much it.

Edit4: Just closed telegram messenger. It went back to 10% for a minute, then back to 80%. Within that minute I didn't use the computer at all, I just watched the process monitor.

3 additional observations.
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Edit:

Edit: Just disabled all extensions, CPU usage still constantly 70-80%, no change at all.

Edit2: After closing all instances of gnome-terminal, the gnome-shell process' CPU usage dropped from (constant) 90% down to 10%, so I assume it's related to the terminal.

Edit:

Just disabled all extensions, CPU usage still constantly 70-80%, no change at all.

Edit: Just disabled all extensions, CPU usage still constantly 70-80%, no change at all.

Edit2: After closing all instances of gnome-terminal, the gnome-shell process' CPU usage dropped from (constant) 90% down to 10%, so I assume it's related to the terminal.

2 added information
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Edit:

Just disabled all extensions, CPU usage still constantly 70-80%, no change at all.

Edit:

Just disabled all extensions, CPU usage still constantly 70-80%, no change at all.

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