Super Laggy App From The Worst Broker

I have been using Oanda apps for at least three months now and there is a reason why I don't think I want to continue trading with them. First of all the app was super laggy, it is really annoying when you want to place a position. It took a long time just to open the charts, how am I supposed to build my strategy if I can't even see the charts? I can understand if it's happened once in a while or even during news releases. But this happens more often than I wish it would. I had to switch strategies because of this, then I became quite successful. But then Oanda closed my positions without any notice at all! I ask them through live chat and they said it's their right to do so! They didn't even bother to give me explanations. Truly the best broker of the century.