LightPainting

Hi, I'm new to this and I'd like you to throw me a big hand that I do not have much idea to say nothing of arduino and built and led strip ws2812 with the indications that are discussed in this open source page, I'm gone all perfect at the time of executing it and it works well.

What I would like is to play the LEDs much faster than this code has very low playback speed but then you can remove speed but the maximum is still very low and I do not know how to program it at its maximum playback speed.
I leave the link of the partner who published it.

Thank you and I hope you could help me as soon as possible, I need it for July 6th