A simple processor swap has done wonders for the XPS 13 convertible. Raw CPU gains are not as impressive, but the graphics are up significantly without impacting battery life or power consumption.
https://www.notebookcheck.net/Dell-XPS-13-9310-2-in-1-Review-Better-than-the-XPS-13-7390-2-in-1-in-one-specific-way.566248.0.html