Continuing the discussion from First topic, what about the MOD Duo?:
You mentioned that latency could depend on the plugins, although that is partically correct, it is also partially wrong. It does depend on the plugin - but only if the plugin does things like FFT processing.
To answer the question:
1> EQ, Distortion, Reverb, Delays, Echos, Wah, Flanger, Chorus, etc, do not add any extra latency, over the audio-processing latency.
2> Pitch Shifters (the FFT processing types and various other "time/frequency domain" processing algorithms) do have a latency - this is physics - you cannot have time and frequency, only a balance between the two. The reason the "octave doubler" feels slower, is that it requires X amount of time to analyse, track the pitch, and then generate a lower fundamental frequency. Although this can be optimized, cheated by guessing, or hidden by physco-acoustic models, the physics behind such pitch tracking is undeniable
Hope that gives some insight into plugins and latency! Cheers, -Harry