TDE Performance and Cost Threshold for Parallelism
Whenever you've got an overall general performance question like this, start by asking, "What's the server's primary wait type?"

My favorite way to get that is with sp_BlitzFirst @SinceStartup = 1. (Disclaimer: I'm one of the authors of that open source script.) The first section of that will return your top waits since startup. If you post that output here, you'll get a lot better diagnostic answers.