Myths and Facts about Slow Java

on YouTube ↗59m

" summary

A Java performance talk that examines common myths about what Java is fast or slow at, using benchmarks and real-world examples. It analyzes JVM strengths and weaknesses, explains which optimizations the JIT (dynamic compiler) can perform, compares Java and C++, and discusses common measurement pitfalls—including limitations of profilers and JMH.

AI-written summary · about

" chapters (14)

1. 0:00Introduction
2. 2:26Java memory myth
3. 8:00Java file handling
4. 10:12Java network performance
5. 14:28Java for high load
6. 16:14Java cryptography
7. 18:47Computation optimization
8. 22:14How HotSpot works
9. 29:23HotSpot optimizations
10. 41:43Synchronization issues
11. 43:13JVM optimizations
12. 46:11Dangerous JVM flags
13. 48:40Benchmarking errors
14. 55:50Bytecode analysis

" related talks

• 59mJava Is Slowing Down: CodeCache EditionVladimir Sitnikov · JPoint 2019
• 59mAn Introduction to JVM PerformanceRafael Winterhalter · JavaDay Lviv 2016
• 51mJava vs CPU — round 2Krzysztof Ślusarski · Confitura 2025
• 01h 01mAn Introduction to JVM PerformanceRafael Winterhalter · JavaOne 2015
• 51mJava at Speed: Getting the Most Out of Modern HardwareGil Tene · Oracle OpenWorld 2017
• 55mWhat's Going On in Java?Jakub Kubryński · Confitura 2013
• 29mThe Java and the Furious: how to measure the speed of your Java code with JMXYeray Darias · Codemotion Madrid 2016
• 59m6 misconceptions about modern Java. Denis Makogon. Java Fest 2020 OnlineDenys Makohon · Java Fest 2020