To be fair, I'm not sure I would endeavor to make a mobile-only web app load 10000 elements to the DOM all at once. When I set to 2000, for instance, I can get below 200ms on Android 4.1.1 in chrome.
You've got to be wary of the cheapskate. In my experience, its traditional for american headquartered companies to view non-american workers as second class.
You are worth what someone is willing to pay and you will find someone whom is less ridiculous with a starting rate.
"If the people with the greatest innate love of and aptitude for programming are evenly distributed among the world's population, 95% of them are born outside the US."
looking for web development help?