Although the Asus EEE Pad Transformer TF101 is my favourite Android tablet by far, I have noticed pauses and lags occasionally whilst using the detachable keyboard. Although not a deal-killer, it has become annoying enough to motivate me to find a solution.
Poking about in the maze of settings and keyboard options that could potentially impact entry delays, I rapidly discovered turning off every typing assist feature not only improved performance, but were features I preferred disabling anyway. This is most likely because I live in front of a keyboard, and find things of this nature more annoying than helpful. However if you find word completion, auto-capitalisation, and related typing shortcuts handy, you may wish to skip this tip, or selectively choose the keyboard options that you to tick off (so to speak) in Settings.
View the screenshots above for a step-by-step guide on each feature I turned off, thereby completely eliminating typing pauses.
NOTE: Entering text on some AJAX based web pages, you will still experience odd lags. This will not be caused by your tablet, they can and will be caused by a variety of factors such as network latency, connection speed, remote web server speed, page programming techniques (JQuery I am looking at you), etc.
Disclaimer: I am not associated or employed by any company producing software or hardware reviewed on this site.