How to pick very fast ?

• Hold your pick firmly, but not to the point that you're straining yourself.
• Use 1mm+ picks for faster playing...Any lower than that are just too flimsy.
• find out what you're doing wrong and fix it. Without knowing how you pick,
  there's too many places you could be going wrong to help you with any specifics.
  Most likely a new pick won't help. There isn't any magic exercise that will help.
• Use metronome
• Use alternate picking
• Holding the pick
  
  You want to hold the pick firmly, and grip it more towards the point so there's less pick to obstruct the movement over the string. Your index finger should almost cross over downwards behind your thumb because creating an "O" with your thumb and index gives more stability for this type of playing.
  
  
  
  Practice about pivot point --- Now, holding the plectrum towards the pointed "nib" so it has solid support from your thumb, pivot your wrist so that your plectrum is touching the fat E string.
  
  
  
  Fast Guitar Picking - Scratch Guitar
  Head over to the Palm Mute Guitar lesson page if you need to learn palm muting or don't know what the hell it is.
  So, using the same positioning as for palm muting your going to be applying alternate picking to allow for much faster rhythmic playing. Now you have upstrokes to fill in the gaps between the downstroke beats meaning you can play double or triple the speed.
  Ok, try turning up the gain on your amp to get more of a rock/metal tone and play the sound clip below...