Waterfall view - request timelines and concurrency at a glance
Spider already offers a grid for browsing communications one by one and a sequence diagram for reading call flows.
Neither of them answers the question at a glance: when exactly did this request happen, how long did it take, and what else was running at the same time?
The waterfall view is the answer.
It places every communication on a shared timeline as a horizontal bar.
The bar's left edge is the start time; its width is the duration.
Slow requests are instantly visible as wide bars; gaps between bars reveal idle time; overlapping bars reveal parallel activity.
The centrepiece feature is lane grouping, which groups communications by endpoint pair and stacks concurrent ones vertically - turning the waterfall into a concurrency map.