Oscillators and LFOs not too heavy on CPU

[potato6]

Thanks a gain for the replies. You are right, I'm probably doing something wrong with the tune. For example, if I have to tune the oscillators for a glide, pitch envelope, lfo on pitch or even just octave and fine tuning, I do it with a call to a function for every sample. This might be the problem. I'm not sure what should I do to improve that tune process, maybe I can use a buffer?