Google buys another company AppJet it is an innovative online word processor. The EtherPad team includes three former Googlers and the EtherPad will be available for the existing users until March 31, 2010.
But at the same time, other real time editors like Google Docs will broadcast an updated copy of the documents to everyone for every 15 seconds. This creates a noticeable lag that gets in the way of collaboration.

Moreover, you can start editing something, only to find between 10 seconds that someone else deleted it. EtherPad was updating every copy of the documents for every half second. This 30x increase in speed can change the experience completely.

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