You land at T5
You go thru customs and immigration at T5
You collect your thru checked bag and re check at T5.
If it isn't thru checked, it goes on the train with you to T1
You take the train to T1, go thru security
Go to Polaris lounge
I made it from door on plane open to T1 at Polaris lounge (I had a 5hr layover at T2) in about 23 minutes just last week. I have Global Entry and Pre Check. I would have been quicker, but had to wait for bags.
If you don't have global entry, then add probably 15-20 minutes. (most of that time, you will need for bags anyway.)
2:15 is your layover, you should have tons of time, I mean even if everything went south, it is still tons of time. T5 is kinda nice as all they do is Int'l, so you have zer domestic traffic to worry about, everyone is in the same boat as you and they try and get you in and out quickly.