IntentCAD Viewer — Closing the DWG FastView Gap

DWG FastView is the benchmark. It's the viewer AEC professionals already use. It loads fast, zooms smooth, and never locks the UI on a 50MB drawing. If your browser-based CAD viewer doesn't match that bar, nobody will trust it with real work. IntentCAD's viewer wasn't there yet. It worked. But "works" and "feels right" are different categories. The drawing would freeze for a few seconds on load. Zoom was instant — which sounds good until you realize instant zoom with no interpolation is disorienting. And when you selected three entities, they all turned the same shade of blue. Good luck telling them apart. Two PRs this week fixed all of it. The Main Thread Problem The dxf-viewer library does everything on the main thread by default. Font loading, fetching, DXF parsing, geometry preparation — all of it blocks the UI. On a small test drawing, you don't notice. On a real architectural floor plan, you get 2-4 seconds of frozen interface. The fix is three lines in a web worker file: // web/