OpenStreetMap

Technical Guide

ripgrep Cannot Search an OpenStreetMap pbf — Wide Field Part 6: 148 s Through osmium, 29.3 s Direct, 6.8 s From the Second Query On

Two and a half minutes of waiting. That is one query: osmium cat expands an OpenStreetMap pbf into XML, rg rea…
2026.10.02
Technical Guide
Technical Guide

Everything We Measured on Huge Files — Four Boundaries Where the Numbers Flip

The ceiling was 950 MB/s. That "N seconds" figure — at what file size, and on which attempt? Change either one…
2026.09.19
Technical Guide
Comparison

Editing a 48GB File — and Saving Mid-Way: EmEditor vs UwView Pro (Edit) on the Same Windows Laptop

Last time we compared "opening a 48GB file and searching it." This time we go one step further — editing it, a…
2026.08.29
Comparison
Technical Guide

I Replaced 21,994 Occurrences in a 10GB, 100-Million-Line File in 16.8 Seconds. It Cost 3.7MB

This is what happened when UwView Pro's Edit Upgrade — Huge Files, No Rewriting was pointed at a 100-million-l…
2026.08.27
Technical Guide
Technical

Opening 258.68 GB and 4.5 Billion Lines — Expanding the Whole US OpenStreetMap to XML and Measuring It in UwView Pro

A few days ago I measured the speed gap between the native and browser builds using a 3.16 GB, 100-million-lin…
2026.07.29
Technical
技術解説

How much slower is the browser build? — UwView native (UVF) vs WASM, measured on the same file

UwView, the large text-file viewer, runs both as a native desktop app (UVF) and in the browser (WASM) — the sa…
2026.07.26
技術解説
Technical Deep Dive

I Opened 51GB / 890M Lines of Real Data — Then Calculated How Far It Could Theoretically Go (~9.2 Quintillion Lines)

When I released my large-file text viewer UwView on GitHub, I claimed it "handles up to roughly 200 million li…
2026.07.25
Technical Deep Dive
Technical Explainer

UwView Opens 51GB / 890 Million Lines of Real Data (OSM Japan) — “Apology: The 200 Million Lines Claim Was a Lie”

A while back I wrote an article about releasing the large-file text viewer "UwView" on GitHub. It claims to ha…
2026.07.09
Technical Explainer