We’ve reduced the overhead of using performance.mark() and performance.measure() APIs with a large set of performance entries. Plus, we’ve modified paint suppression during load to greatly improve warmload performance in Site Isolation mode. You’ll also notice a small reduction in Javascript memory usage. With this release, you’ll notice faster Javascript property enumeration as well. We’ve also implemented better scheduling of garbage collection which has improved some pageload benchmarks. This release also sees reduced CPU usage during socket polling for HTTPS connections. Additionally, you’ll notice faster storage initialization. We’ve also improved cold startup by reducing main thread I/O. Plus, closing devtools now reclaims more memory than ever before. And we’ve improved pageload (especially with Site Isolation mode) by setting a higher priority for loading and displaying images.

Wow, that’s cool!