slow debugger after upgrade to 2026.2.1
Answered
After upgrading today to IDEA 2026.2.1 any Java Spring Boot application started in DEBUG mode with JRebel Plugin are 3x slower than before. If starting the app with the same config but in RUN mode everything works as before. I've read the tips mentioned here but this doesn't solve the problem. Any suggestion ?
Java 25 / Spring Boot 4 / Vaadin 25.2
Kind regrads
Dominik
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I see that the latest JRebel 2026.3.1 officially supports IntelliJ IDEA up to version 2026.2.
There is also a recent review on the Marketplace reporting a memory leak with JRebel on IntelliJ IDEA 2026.2.1: https://plugins.jetbrains.com/plugin/4441-jrebel-and-xrebel/reviews
As a first step, I'd suggest debugging the same Spring Boot configuration with JRebel completely disabled. If startup performance returns to normal, that would strongly indicate the slowdown is related to JRebel.
In that case, I'd recommend temporarily downgrading to IntelliJ IDEA 2026.2 or another earlier 2026.2 build known to work with your JRebel version until 2026.2.1 is officially supported or the issue is resolved by JRebel.
If the issue persists even without JRebel, please collect logs via Help | Collect Logs and Diagnostic Data and upload the archive to https://uploads.jetbrains.com so we can investigate further.