Even though Waves could improve the gateway speed by increasing fee's you still have the usual bitcoin delays... which right now are terrible. I've waited hours and hours for transactions to go through from all different wallets and exchanges.  The problem is ultimately bitcoin scalability not Waves.  Although they should increase transaction fees to help ease the problem.

On the other hand don't let this distract from the speed of the Waves blockchain! It is crazy fast! I love sending Waves tokens around the blockchain I see the transaction in my wallet pretty much instantly and its confirmed in 30-60 seconds.  It's so nice to be able to trade on an exchange and and have the coins I'm selling go from my wallet, trade and the new ones appear in my wallet (under my control) within seconds! Imagine how that will effect people trying to catch a pump/dump. No need to leave your precious bitcoins on exchanges waiting for that next Gox moment. DEX is going to change the face of crypto trading.