On the whole, Chrome seems to be kinder to AMD CPUs than Edge. The Threadripper 2990WX can generally outpace the Core i9-7960X and Core i9-7980XE, and it tends to hang right with the Core i9-7900X. It's impressive that we don't have to sacrifice much, if any, single-threaded responsiveness to get 32 cores in an X399 motherboard.
The WebXPRT 3 benchmark is meant to simulate some realistic workloads one might encounter in web browsing. It's here primarily as a counterweight to the more synthetic microbenchmarking tools above.