[sotojuan]

> Are the transactions (issued from within the browser) performed optimistically? If so, will this not give "flicker" in the browser in case a transaction needs to be rolled back? Is it also possible to easily perform a transaction from the server (i.e., not optimistically)?

I was at the Lisp NYC talk where David talked about Om Next. He specifically spent some time talking about this and demonstrated how to perform optimistic updates that do not flicker.

I can't really say anything else (the talk was great, but way above my head at this point), but it seems to be able to do that.