Charts That Handle 100M Points Without Freezing

A new open-source tool renders massive datasets in your browser almost instantly — the kind of thing that makes dashboards finally feel alive.

A wall most dashboard builders hit eventually

At some point, if you're tracking enough — sales over years, sensor readings, foot traffic by the minute — your charts stop working properly. They freeze. They crash. Or they just give up and show you a blurry blob instead of your actual data.

This week, a team called Reflex quietly released something called xy. It's a charting tool for people who build software dashboards, and it does one thing unusually well: it handles enormous amounts of data without slowing down.

We're talking about tens of millions of data points rendered in the time it takes to blink. The trick — if you can call it that — is that instead of drawing every single dot, it only draws what fits on your screen at that moment. Zoom in, and it fetches more detail. The original data is always there; it's just smart about what to show.

For anyone running a business with real-time data — a logistics operation, a financial firm, a factory floor — this matters. Dashboards that freeze or approximate are dashboards you stop trusting.

xy is free, open-source, and built to slot into existing tools developers already use. It's early, but it went viral in developer circles almost immediately, which usually means it's solving a real pain.

Words worth knowing

Open-source — The code is public, free to use, and maintained by a community rather than sold by a company.

Dashboard — A screen that shows live or historical data visually — charts, counters, maps — usually updated automatically.

Rendering — The act of turning raw data into something visible on screen. Slow rendering = sluggish charts.

Decimation — A technique that reduces how many points are drawn without losing the overall shape of the data. Like sketching a face instead of painting every pore.

If you've ever had a client ask why your charts are slow, or if you're planning any kind of data dashboard this year, this is worth mentioning to your developer.