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
You can scroll down and click the Switch to Mobile Version tab at the end poloniex.com site. Or just put m.poloniex.com to the address bar. Mobile version is running just fine with both phone and desktop/laptop.
The Desktop is very sticky also on my laptop, so I use the Mobile Version without any problems. For some reason the Desktop Version is running just fine on my Android Phone. I just do not understand how it is possible. But it is. I anyway use the Mobile Version also on my phone while the text fits better to a small screen.