Right Hand Technique

I guess there are many ways to increase one's fingering speed. One of them is to practice your scaling, plucking near to the bridge area.
Reason is simple since the tension is greater at the bridge area, it require more strength to pluck.
So as you practice more, your finger will be strengthen and hence can play faster and longer duration too.

Billy Sheenhan make use of his bass pickup and his 3 finger technique in order to play fast. You can check out his DVD to see his live examples.

Victor Wooten uses his unique thumb and finger technique. The concept is thumb down, thumb up, pluck with forefinger and pluck with middle finger. He teaches that on the bass Day 98 DVD. That is a "must watch" DVD for those who are interested to explore bass.

Abraham Laboriel uses Thumb follow by pluck with forefinger and middle finger. You can also learn about chords and thumping at his Beginning Funk Bass DVD.

Bass Strap

This is a simple but useful tip about bass strap.
Some people asked why when they practice a bass lick at home and it is smooth but when they jam with their friends, that bass lick has more difficulties to come out.

One possible reason is that the bass strap is not adjusted to the comfortable length when you stand and play, while at home it rested nicely on your lap.

If you want, you can practice at home with the strap on as if you are standing.
Many rock and heavy metal bass players like to put the bass near their waist. For people with long arms you can do that but might face slight difficulties when slapping.

cheers