[CART360] C programming with Arduino?

[Didier]

As you may know, me and Karim are trying to build a LED matrix that acts
like a screen. One problem we stumbled upon is that when refreshing every
LEDs, the refresh is to slow to fool the eyes and we see blinking occurring.
So I was thinking about ways of optimizing the code to have it run faster,
and I was wondering wouldn't programming it directly in C code boost it's
performance? I also just can't gt information on how to program in C instead
of the Arduino Language. Can anyone point me to some good information on it?
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