How do I strengthen my fingers for guitar?
Hold the fingers down as you go: When you put down your little finger, make sure that all your fingers are still pressing down in the correct frets. This is what helps you develop the stretch between the fingers, which makes them more agile. Holding them down also works the muscles, making your fingers stronger.
Why are my fingers so slow guitar?
Speed in your fingers has alot to do with how relaxed your arm from the shoulder down is. Try relaxing more while playing. And try stretching before playing to get your fingers relaxed.