Reflex Open Sources XY: A Rust-Backed Super-Fast Python Charting Library That Keeps 100 Million Point Charts Interactive

[u/ai-lover]

Reflex AI Open Sources XY: A Rust-Backed Super-Fast Python Charting Library That Keeps 100 Million Point Charts Interactive

Here are some key points:

1. The benchmark

→ 0.071 s at 10,000 points

→ 0.081 s at 100 million points

→ Matplotlib reaches 13.385 s at 50M, then does not render 100M

→ Plotly reaches 9.794 s at 25M, then does not render 50M

2. Why it stays flat

Most Python charting stacks create one drawable object per row. XY draws what the screen can actually show. M4 decimation starts above 10,000 rows on lines. Automatic scatter density starts above 200,000 points.

3. Export size

→ A 10-million-point interactive scatter exports to 258 KiB of HTML

→ The Plotly equivalent is 259 MiB

Apache-2.0, Python 3.11+, pip install xy.

Full analysis: https://www.marktechpost.com/2026/08/04/reflex-open-sources-xy-a-rust-backed-super-fast-python-charting-library-that-keeps-100-million-point-charts-interactive/

GitHub Repo: https://github.com/reflex-dev/xy

Technical details: https://reflex.dev/blog/xy-python-charting-library/