• 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!