For large models, there is currently a long-blocking call to conway, which leads to browser detecting a stalled js script.

Maybe if we had a tick every NNN at index.elements.push https://github.com/bldrs-ai/conway/blob/main/src/step/parsing/step_parser.ts#L782
that would allow for a simple update of Parsed NNN elements.

We could also simulate this in Share by having a timer tick, but then we'd miss if conway is actually stuck. So having a real updating report would be useful for user info and also possibly debugging, with "what's the last message you see on the progress reporting"

eg

https://github.com/bldrs-ai/web-ifc-viewer/blob/30ca8950ef030b5576c2f44a8565dff418a3dba8/example/main.js#L151