Where are you trading at and with what app? I'm using Poloniex for buying my Monero, but the UI is soooo slow and nearly broken on my android.
Polo crashes my phone, and my mediocre laptop barely functions. Crazy resource hog. Since I don't trade much, I can put up with it to buy my moneroj. It sure would be nice to have a 'light' version with fewer features though.
I also don't trade much and would not attempt it at Polo on my new android phone. I find it almost impossible to scroll through the order book. I did cancel an order once.
To check the price I use bitcoinwisdom, no lag at all. One stop shopping
There is a great free Android app, zTrader:
https://play.google.com/store/apps/details?id=co.bandicoot.ztrader
You can add Polo API keys there and trade Monero or anything else. It works flawlessly.