AWS us-west-2 server connecting to db have become slow

We got a mail from AWS that they will change the underlying hardware for one of our server and that did happen. However after that we are seeing a latency to connect to db from the server. Even for command line sql client we can see a difference between when the sql prompt comes back. The other server returns quickly but this server which has been migrated to new server shows a visible lag. In fact the server that is showing issue is in same availability zone as the rds. This is in west 2. Anyone else is seeing that? Also what are the ways to debug and find the root cause. Nothing has changed from our side for at least 2 months and the only new event is the change of underlying hardware.