Hi,
I run PrUn on a older Thinkpad X230 in Linux Mint using Firefox.
Whenever a blinking bar exists, to notify me about new chat post for instance, or new entries in the notifications window, the CPU load shoots up to 100%.
As soon as i read the chat or mark the notification as read and the blinking bar disappears, the CPU load goes back to normal.
Having the map open has the same effect.
Best regards,
Z3nio