*Cough Jxyden 2000 note per minute 1/8 + 1/16 jack master (song is plasma strike btw, its an Ftb chart/map)
Seriously though practice is still what matters most. What dictates the skill improvement rate of a player depends in the type of charts he plays (pattern specific, ranked, or comfort zone stuff) + (or times, its up to the reader) his actual talent or learning speed.
And about best plays, they DO NOT always (sightreads taken into consideration) show a player's actual skill level. It just shows his potential and that improvement is possible.
Overall body condition does help. Boredom, sleepiness, hunger, weak body, and any oher impediment does affect a players gameplay. The magnitude varies from player to player. Same goes for positive conditions.