I have an Asus S410UN laptop with i5-8250, 8GB RAM, Win10home x64 and an MX150 4GB. I recently noticed that the "system" process has a 15% usage even on the desktop (as it's a 8 thread CPU it means it hogs one thread at 100%), started shutting down apps, shutting down Afterburner solved the issue. Dug into it a little bit, turns out unticking "GPU1 memory usage" on the monitoring page solves the problem. Might wanna look into that. Windows version is 1803, Afterburner is 4.5.0, RTSS is 7.1.0.