Well the cpu usage of the stock is now not so big...
Stock bandlimited - 140-240 cycles(240 with square because 2 saws

)
Stock non-bandlimited - 60-120 cycles
Wavetable - 130 cycles(dry without speed control etc)
Also if the modification or other modul just saving 100 cycles, through the fact, that the lfo runs the hole time, and if you have 2 of them on board, it could save you up to 200 cycles, which is maybe the cycle-amount which the filter would eat.
it`s just "looking for slim and light on cpu as possible"
Also if it`s a LOW frequency osc(concerning the non-bandlimited version), in some cases of sounddesign the lfo`s are used with max. speed amount, and if there the waveforms didn`t running ideal from aliasing, also not so perfect.
The wave-read sounds interesting, tell us more
