asio time usage

what in the computer setup affects the asio time usage? what is the relationship between processor and asio time overload?
i have some sounds in halionsonic2 that is made of 4 layers of sounds that overload the asio time usage.
pc i3, e-mu 0404 pci, asio4all ( 12 ms latensy), 8 gb ram, w7 64 bit, cb 6.5 artist.

thanx in advance

best reguards

Tobias nilsson
norrbölegatan 56
93137 skellefteå
0046 070 2367323