You know something's wrong when even an integrated Vega 8 can outperform your dedicated Radeon GPU. The Inspiron 17 3780 may sport the newest Intel Whiskey Lake-U CPU, but the decision to pair it with an outdated Radeon 520 is a head scratcher.
https://www.notebookcheck.net/Dell-Inspiron-17-3000-3780-i7-8565U-Radeon-520-Laptop-Review.420281.0.html