this is a good exercise to practice and improve your speed
here is the pattern:
|G|| 3412 |
|D|| 3412 12 12|
|A|| 3412 12 34 |
|E||12 34 |
If you want to mix it up a bit, you can try using the same frets, but in a downward
pattern starting on the G string and descend down the strings.
|G||12 34 |
|D|| 3412 12 34 |
|A|| 3412 12 34|
|E|| 3412 |
but be careful with this one, because it sounds a bit different
these are not to be confused with the spider chord technique on guitar...