How IntelliJ IDEA Performance Improved: Past, Present, and Future

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" summary

Recap of concrete changes and results: startup drops blocking constructor-based components in favor of lazy service lookups and parallel classloading, raising startup MegaApdex 0.85 → 0.94; indexing becomes multithreaded with a recorded 25% multithreaded indexing speedup and disabling automatic Gradle source downloads yields ~50% faster indexing on Spring Boot; parsing JSON/YAML switches to Jackson parser: inspections 18s → 1.5s; completion ranking uses an ML model to improve relevance, and K2 integration shows K2: up to 4× faster completion in many cases. Tools: IGPerf, async profiler, OpenTelemetry-style metrics.

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" chapters (18)

1. 0:00Intro
2. 0:47Metrics
3. 6:09MegaApdex
4. 11:48Startup
5. 15:16Components and Dependency Injection
6. 18:16Coroutines
7. 20:48Classloading
8. 23:38Indexing
9. 27:39Actions available during indexing
10. 30:03Completion
11. 31:48Highlighting
12. 37:46JSON Schema
13. 41:40Freezes and Lags
14. 46:11Import of projects
15. 47:43Word on K2
16. 49:34Tools
17. 50:39Thank you
18. 51:30Q&A

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