Drag a part here, or click one on the left
or
Scroll to zoom, Ctrl (or ⌘) + scroll to move around, hold Space and drag to pan. Drag on empty canvas to select several parts; Shift-click adds one. Fit brings the whole design into view; Tidy up arranges it into columns and rows.
What fails first
The parts with the least room left, busiest first. The top one is what fails first as traffic grows.Nothing is above the headroom target at this traffic. Try judging at peak — that is where sizing decisions get made.
Playground
The design workspace needs a laptop-sized screen — a canvas, an inspector and a results panel do not fit side by side on this one.