If you slow it down too much, it will lose its "exciting" feel. I imagine this on a games website and think it needs to be fairly fast in that context.

maybe if i added more of the frames, maybe 3 frames per a pic?

Try it. I'm no expert on animation but it sounds a reasonable experiment.

i did bout 5-7 frames per pic, and set it on 400%

i slows the animation to 50%