[quintin3265]

I implemented the caching system I described yesterday. I was not able to test it fully before pushing it out, as this is a sort of emergency release. This weekend, I'll do more thorough testing to see if anything was broken by the change.

The disadvantage of this new system is that the grids are only updated every four hours. The song details pages are still real time. Previously, it took 2 minutes and 7 seconds to query the front page grids, while now the score grid takes about 0.8 seconds to query, a 100-fold improvement.

There are additional simple things I can do to get the load time down to 0.2 seconds or so, but I need to resume normal life for a little while. Please report any bugs.