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Some buttons to pause and scroll through the game might be a good idea. You
should realize, however, that it is only this fast because the full game is
already on the server. If the game is actually being played, the rate at
which the moves would be displayed is determined by how fast the engines
produce them. So in a 5-min blitz game (300 sec), moves would come every 8
sec or so, which is 8 times slower than what you see now. If people on the
average would still consider that too fast, we can play 10-min games.

The fast playback mode is really meant only to catch up with a game in
progress, when you first tune in. It seemed better to have the moves come
by once a second, so that the spectator can at least get a vague idea how
the current position originated, than to instantly flash the current
position. But the display must be a bit fast to catch up with reality.

Once someone is watching, he typically request displaying a new game as
soon as the previous one finished, and at that point there are no stored
moves to display. And it is a good thing that, as soon as people click the
page, they immediately see something happen. If they would have to wait on
average 15 sec for a move to be made, they might already have gone
elsewhere. A 'slow replay' button might be appreciated, though.