What is a good way to improve my handwriting in terms of speed and neatness?

I have a major problem when it comes to handwriting.
I try my best to write quickly and neatly at the same time, but at the end I realize that actually I failed at both. I’m desperately looking for a good solution to this dilemma and I’m really not sure what I can do about it.

Any hope I can find some good suggestions here?
Thanks very much.