为什么按钮需要很长时间来响应离子中的ng-mousedown？

I have been trying to develop a very basic game using Ionic. Initially, I was using pure JavaScript to listen to clicks and then act on them but the response time was very long. When I asked a question on Stack overflow, it was suggested that I should be using Angular JS to work optimally with Ionic apps. Now, I have started using Ionic but the response time is still very very slow. I have been trying to develop a very basic game