why the price up and down in ask an bid before it hit the real chart in the exchange i trade in bittrex
and it takes about 10 to 15 second to the price appear in the chart
Perhaps because of three possible reasons. First thing, your internet connection could be unstable. Second thing, it could be because your deivce is lagging (due to running multiple apps wherein ram can't handle very well). The last possible reason is that their website is malfunctioning due to bug issues which I haven't encountered yet from my almost 2 years of experience in using Bittrex. If you're convinced that they are lacking the optimzation, better to shift to another exchange such as Binance, BitTrade, and etc.