I code with mouse to move the cursor, and I coded fast enough to compete with the fastest in the world in competitive coding. So I don't think keyboard is significantly faster, if it were I wouldn't have been able to write solutions as fast as the fastest in the world did.

But I think its fair to say that its much easier to learn to use a mouse effectively than keyboard navigation, so most people are probably faster with a mouse.

I did try to use keyboard only editors, spend a lot of time on that, but I was always much faster with mouse cursor to navigate and rearrange or copy parts of the code.