Setting Windows to High Performance mode could drop performance by as much as 90 percent. We're able to reproduce the bug quite easily by toggling the Windows power profiles while running the CineBench Multi-Thread test.
https://www.notebookcheck.net/Acer-Aspire-5-with-Core-i5-Comet-Lake-U-might-have-a-huge-performance-bug.453790.0.html