This page describes the new features enabled by V8 and how you can enable V8 for use in your scripts. Migrating scripts to V8 describes steps for migrating existing scripts to use the V8 runtime.
Source: V8 Runtime Overview | Apps Script | Google Developers
Member of Google Developers Experts Program for Google Workspace (Google Apps Script) and interested in supporting Google Workspace Devs.
This is such a great update…particularly async functions and object/array destructuring will really clean up larger projects that have had to rely on very verbose code.