Abstract: Asynchronous interfaces allow users to concurrently issue requests while existing ones are processed. While it is widely used to support non-blocking input when there is latency, it's not clear if people can make use of asynchrony as the data is updating, since the UI updates dynamically and the changes can be hard to interpret. Interactive data visualization presents an interesting context for studying the effects of asynchronous interfaces, since interactions are frequent, task latencies can vary widely, and results often require interpretation.
In this paper, we study the effects of introducing asynchrony into interactive visualizations, under different latencies, and with different tasks. We observe that traditional asynchronous interfaces, where results update in place, induce users to wait for the result before interacting, not taking advantage of the asynchronous rendering of the results. However, when results are rendered cumulatively over the recent history, users perform asynchronous interactions and get faster task completion times.
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