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Re:Asynchronous UIs - the future of web user interfaces by HnNoPassMailer on Wednesday November 16, 2011 @02:40PM (#3244692)
TL; DR:

  The idea is that you update the client before you send an Ajax request to the server.
"Optimistic updating", not "Asynchronous UI". The UI is already asynchronous (regardless of UI updating order).

  "request/response model". 
"Pessimistic updating" -> i.e. update UI only after successful response
Re:Asynchronous UIs - the future of web user interfaces by secoif on Wednesday November 16, 2011 @10:42PM (#3246295)
Agreed. Optimistic/pessimistic UI communicates the concept far much more clearly.