Alright I tried editing the speed issue, though it was a bit tough because at the end it didn't look very smooth. Also, I edited the arms a bit so they can move a bit since the last one the arms were too stiff.
Edit: I am still working on the walking animation, though I have to say that my main problem right now is the anatomy in the legs and waist, since the character has somewhat of thin legs. I will find a way around this though, thank you so much for the nice tips.