Thanks Gazza1, hellscabane and Disastrus. The trade lag/speed issue seems to come up often.
I do wish that some exchanges that trade many cryptocurrencies only allow the trade of coins that maintain enough activity.
Why is that? Is it because there are too many coins displayed in the interface and you want to filter just the active ones (remote the clutter)? Or because the buy/sell orders don't execute when there isn't enough activity? Or something else entirely?