Quoting from the latest documentation available from the JTS website (
https://www.johntillersoftware.com/Updates.html):
"During the replay you can use the following Hot Keys.
F5 – slow down the battle replay.
F6 – play a battle replay at default speed.
F7 – speed up the battle replay.
F8 – play a battle replay at maximum speed.
Esc - will terminate the replay.
[...]
It doesn't matter what your current setting is, your opponent's setting during his
play will determine whether you see the Dialog or the On Map Results in the
replay."