How to increase hand speed?

[ShoulderRoll]

The double end bag helps.

Also, take your time to learn proper punching technique and practice it slowly until it becomes smooth. Smooth is fast.

[young_robbed]

Practice practice practice

[dman4093]

Handspeed is overrated.... Timing, feints, technique and accuracy is way more important but if you really want to try here is a simple drill.
beggining of your workout so you can use your speed, do 10 30 second speed drill where you punch as fast as you can with 16 ounce gloves or two pound hand weights.