advisor slow to submit my research article
You believe the paper is ready. S/he doesn't, it seems. Ask him what conditions the paper needs to fulfil to make the paper submittable, and, if it is something that you can do, do that. 

If it's him/her who needs to read the paper (but you say they approved of the arguments), then ask how you can proceed to make the paper being wrapped up soon, to avoid scooping.