Performance of playing

[FrankHB]

Some large map like Nico Nico Douga - Nanairo no Nico Nico Douga would cause the program not responsive for quite a while when loading to play. This should be improved as osu! does. Another minor performance problem is memory management. It seems that the program allocate and deallocate memory as soon as required. This may cause too many unnecessary page faults and it is bad to the whole system performance. It can also be improved, e.g. trying preallocating/pooling ~ 10MiB (which should fit for most songs without video).