EI is not a member of TSA Precheck so you are stuck in the horrible queues at ORD (unless you are arriving into ORD on a domestic flight and can transfer airside via the bus and thus avoid security)

You will have access to Global Entry immigration at Dublin, fast track security will be offered only if business class.

As stated above any passenger flying from Dublin must comply with the presidential proclamation, if you attempt to check in your ESTA will be cancelled if you hold one.