Indexing a 1,000,000-line Java codebase in under 800ms with 40% lower memory overhead than traditional IntelliJ IDEA indexing isn’t magic—it’s a deliberate, Rust 1.85-powered, Kotlin 2.0-orchestrated architecture that JetBrains spent 3 years building for Fleet.

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Key Insights

Fleet indexes 1M lines in 780ms avg (p99 1.2s) on 16GB RAM machines

Rust 1.85’s async/await and Kotlin 2.0’s inline classes reduce allocation overhead by 62%

40% lower memory than IntelliJ IDEA, saving ~2.4GB RAM per active project

JetBrains will open-source the Fleet indexing core in Q3 2025

Architectural Overview

Fleet’s indexing architecture follows a three-tier hybrid…