Google developers revealed this week that they have removed the 300ms tap delay from the latest build of Chrome Beta for Android devices.
This delay has been removed specifically for mobile optimized websites that do not expand when you try to zoom into.
This tap delay was added to ensure that users could tap in to zoom into web pages. Googler Jake Archibald said:
You’ll find large articles throughout this site dedicated to shaving 10ms here and 90ms there in order to deliver a fast and fluid user experience. Unfortunately every touch-based mobile browser, across platforms, has an artificial ~300ms delay between you tapping a thing on the screen and the browser considering it a “click”. When people think of the web as being sluggish compared to native apps on mobile, this is this one of the main contributors.