Yes, RFC provides the great performance, while OData is slower.
Please see the below update from my internal team.
Currently, there is no ETA for the OData implementation. The reason behind this implementation choice is because OData is 10x slower.
There should be a public statement release in the following weeks about this.
So the options here are-
use SAP CDC via OData when it's ready(no ETA yet) or use the existing OData connector.
I hope this answers your question.