Discounts app improvement

I have an android application called A3raf. A3raf is a deals and discounts app our database is ms sql we have a web portal for stores to add their deals. the app asks the user for their city and shows the deals in this city the app also sends notification every time  a new deal is added We need to make a few enhancements and fixes 1-the app is very slow and takes some time to respond 2-it crashes 10% of the time with a "unfortunately A3raf has stopped" Message. 3-the notifications doesn't get delivered to most of the users. 4-we need to add google mobile analytic 5-Gmail login you can find the app here: [login to view URL] if you need any more info plz ask.