Programmer DD

Nov 9, 2020 · Backend Development

How to Speed Up Java File Compression: From 30 Seconds to 1 Second with NIO

This article walks through a real‑world Java file‑compression task, shows why a naïve implementation takes 30 seconds for a 20 MB batch, and demonstrates five progressive optimizations—BufferedInputStream, NIO Channel, memory‑mapped files, Pipe, and code snippets—that cut the time down to about one second while explaining the underlying I/O mechanisms.