Used https when adding the remote library. . So every time I have to use https to push to the remote library, the speed is still slow. .

View the transport protocol used:

git remote -v

Reset to ssh method:

git remote rm origin
git remote add origin git@github.com:username/repository.git
git push -u origin master

git config --global credential.helper store

git config --global credential.helper "store"

You can see it in the .gitconfig file after configuration

Because you are currently using the https submission method, just change it to the ssh method.