I believe we already use GZIP for this, I tried using Brotli but we had complications. However, gzip is already being used for compression on most if not all calls.
If you use the Chrome Devtools, the network tab can show this, could you verify this yourself. To open Chrome Debugger hit CTRL+SHIFT+i
Matt Petty
Senior Software Developer
SmarterTools Inc.
www.smartertools.com