What are potential impacts to core web vitals (e.g. page performance)?

By design, Opti Yield has been developed to be frictionless in terms of media performance.

Latency - No latency is induced by the Opti Yield SDK. 

Caching - Opti Yield SDK does not induce poor performance if a CDN is used.

Rocket Loader - Opti Yield is 100% compatible with Rocket Loader and does not cause any problems ( Read More : Does Opti Yield work with Rocket Loader ? )