21CTO

Oct 27, 2026 · Fundamentals

AI Rewrites to Rust Won't Fix Slow Software: Design Is the Real Bottleneck

The article argues that software performance is primarily determined by architectural design rather than programming language speed, because most applications are I/O-bound and slow languages already delegate CPU-intensive work to optimized libraries; real speedups come from redesigning algorithms, caching, and query optimization, not from rewriting in faster languages like Rust.