Re: [whatwg/dom] Proposal: DOMChangeList (#270)

@domenic 

> One concern I have about the idea of running these things in a worker is that the IPC involved in getting back to the main thread (in the case of hundreds or thousands of nodes/nodetokens) would probably be a significant cost. I'm not sure whether it would be greater than or less than the cost of just doing the work on the main thread; similarly I am not sure whether the IPC would be significant enough to cause jank. But maybe all you have to IPC is a single memory location of the queue in which case it is presumably fine.

With the arrival of shared array buffers and atomics, this IPC overhead should be little to none now since the instruction backing buffer can be transfered via a SAB.

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