Okay, you need to to stop limiting bending to the style of martial arts bending was based off of. Granted, martial arts are often used as methods use their bending effectively in combat, hence why Zaheer was so good at airbending. Example, what martial art would this possibly be?
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It's not baguazhang, so therefor Aang can't do it according to you. He was bending without even moving, so it's not limited to the martial art.
Like I said before, and said in the Series Bible, the power, range, and speed of a bender depends on their skill and physical stamina.
Also, it isn't said anywhere that any element is faster than any other. Look how quickly Toph was able to earthbend against The Boulder
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She manages to create a disruption in the earth from her to him before he can even put his foot down, that's pretty quick.
A combination of both points, that applies to this post is evidenced about 1 minute in
That looks like a pretty fast attack, and no martial art has ranged projectiles, so clearly, its not based on a martial art.
Now lets take a quick step into the real world. NO martial art on earth is based off of being slow. Name one situation where moving and reacting slowly could be a good thing for a martial artist. Martial artists are often regarded for their incredible reaction speed and movements.
Not to be rude, but they way you take one observation, manipulate it into a fact, and then stretch it into a law of the universe is really annoying. Can you please start doing more research on the arguments you make? Also, side note, if the speed of lavabending bothers you, you can always change it in the config