Previously the beatmap would begin loading at the same time the
`PlayerLoader` class was. This can cause a horribly visible series of
stutters, especially when a storyboard is involved.
Obviously we should be aiming to reduce the stutters via changes to the
beatmap load process (such as incremental storyboard loading,
`DrawableHitObject` pooling, etc.) but this improves user experience
tenfold in the mean time.
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