Experience the same thing, XCACHE, SUHOSIN, 5.3.1, LSAPI 5.1
Load usually stays around 1.x to 2.x, but since upgrade it goes up to 4.x to 6.x
Switch back to PHP 5.2.9 and LSAPI 5.1, XCACHE, SUHOSIN, load dropped again to 1.x and 2.x
Litespeed crashed randomly using PHP 5.3.1