Improvement to scoreboard system

[Skaty]

Currently, the scoreboard view makes all DB calls at once, which may sound nice, but it's a large GROUP BY query with multiple annotations.

This may cause a performance issue as the call is expected to retrieve every Score from the DB.

Suggestion: Use AJAX to retrieve scores for each individual game and spread out the calls such that the DB calls are spread out across a predetermined timespan (5 minutes?).