Magyar, Mac NinjaTrader user here. Toronto. You can use NinjaTrader on a Mac. See https://support.apple.com/boot-camp
I think that may depend on perhaps the speed of your computer, WiFi, and broker. You might try searching the NinjaTrader Forum on this https://ninjatrader.com/support/forum/
How did this thread jump from asking if there's Canadians at this forum to talking about Ninjatrader ? wrbtrader