Add content types programmatically into SPList takes too long

Question

I've dozens of CTypes to add to an SPList programmatically (cause content types are provided by CTH) and each oSPList.ContentTypes.Add() takes almost 1sec. Is there any other approach ou code optimization for this 'issue'?

using List Definition is not the way to go, cause is required to add all the fields into the schema, and the idea is to get all of that info directly from the provided CT.

Answer 1

Of course, by Calling Synchronous Methods Asynchronously