Doing Windows file transfers over a long-distance/high latency connection (to AWS)

tl;dr - drag-and-drop file transfers over a 1gbps connection with ~30ms RTT, how to make more better?

We have our Windows file servers on AWS West Coast, mapped as network drives for most users in a Windows desktop environment.

We've just opened up an office in Texas with ~50 users who will regularly be moving tens of gigabytes of data back and forth from their workstations to the AWS servers, mostly through drag and drop file file copies.

We are getting a 1gbps AWS Dx installed for this office, but even with that I expect the RTT will be in the ~30ms range which can cause sloth-like performance for SMBv3 traffic (From what I understand).

What are my options for optimization on this connection? Is there changes that can be done on the workstations, or on our firewall on the site (PA-3220)? Or will we have to turn to a WAN optimizer? Any recommendations?

In a prior life I casually worked with Riverbed Steelheads for a site running over a satellite connection, but that was a very different story (16mbps, 1200ms) and I was only doing minor maintenance, not setting up or baseline configuration.