The Neo.data.proxy.Stream implementation shows significant performance degradation when using small chunk sizes (500 items) compared to large ones (10k items) for a 13.87MB dataset (10s vs 2s).

Objectives:

1. Instrument src/data/proxy/Stream.mjs with performance.now() to profile the bottleneck.
2. Analyze the overhead of the timeout(5) delay per chunk.
3. Analyze the cost of Store.add() and the event chain (data -> load -> grid.render).
4. Optimize the proxy and store interaction to handle small chunks efficiently or dynamic chunk sizing.

Proposed Changes:

• Add performance logging to Stream.mjs.
• Make the timeout configurable or adaptive.
• Investigate Store's handling of postChunkLoad events.