I also find my fretting hand can play really fast but so can my picking hand.. just not at the same time.
I can play fast but not as fast as i could do.
I think using a metronome will help you here.
Can you pick fast with your picking hand while not fretting any notes ?
By virtue of their electrical properties, tubes generate a special waveform when they're saturated, which is why tube engineering has tremendous tonal advantages over solid state or DSP solutions, particularly for crunch and lead sounds. Tubes enter the saturation zone gradually or softly, which lends tube-driven tone its trademark yet totally unique character.