Does the CPU usage start to go down after the initial page load?
Will check the laptop in the evening. I'm now at my desktop PC, old Core2 CPU E7300, integrated GPU. Linux. CPU stays at 45%. Initial load maybe up to 60%
On laptop: i5-6267U, 4 cores, Win 10. Loaded the page. Plugged in, CPU runs at 2.9GHz, 35%, fans going into high speed. When on battery, CPU runs at 1.2GHz, 12%, fans not turning...