He he he ...
I actually found a little tip a while back when playing a round in a coin room.
If you are playing against an opponent on mobile wgt version, there is a way to see the green speed before you approach the green, IF:
Your opponent approaches the green before you.
When your opponent makes his/hers approach shot, (right after the swing has been done) quickly go into your profile, then back out. The green speed should now be visible on your screen.