How to reduce the storage size of 3D WebView in my app?

3D WebView for Windows and macOS embeds the Chromium browser engine, which adds ~360 MB to an app's size. 3D WebView uses Chromium Embedded Framework (CEF) to embed Chromium, and CEF considers some of its files optional. This page from CEF describes which files are required and which are optional. If achieving the smallest possible size is important for your application, you can delete the optional files to reduce Chromium's size in the app to ~250 MB. However, as the page notes, removing some of the optional components may impact its functionality.