How processor intensive is analogWrite?

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hey!
how processor intensive analogwrite? if example, use pwm pins in program, hog heck of lot of cpu cycles? ask because trying use 3 servos , pwm leds running trouble when start light led;s. servos bit 'jittery'. have given thought offsetting led pwm attiny. overkill?
thanks.

pwm handled timers; once setup, there's no processor overhead.


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