There must be 10s of factors needed to be considered to find the top cryptocurrency exchange, I mean just being speedy alone will not get all your trading-related issues solved. I am also holding accounts in binance and I'm finding few features which are related to security measurements are good at biannce.

I am also trading at yobit, bittrex, stex and few other reputed exchanges too and I never feel any lag in speed with them. Moreover, if you ask me which is a top exchange in my experience then probably I cannot answer only one exchange as I am good with most of the reputed exchanges.