The saga of the XPS 15 9570's latency issues rumbles on. Frank Azor, the Vice President & General Manager of Alienware, Gaming and XPS at Dell, has tweeted that recently updated Realtek audio drivers should fix DPC-related issues for many XPS 15 9570 machines, while an upcoming BIOS revision should resolve its underlying causes.
https://www.notebookcheck.net/Frank-Azor-claims-that-Dell-has-fixed-many-DPC-latency-related-issues.415861.0.html