Significant Memory Usage Increase in IntelliJ IDEA 2026.1.4 - Performance Concerns
已回答
Hi everyone!
What's Going On:
I'm running into some pretty concerning memory and performance issues after upgrading from IntelliJ IDEA 2025.3.2 to 2026.1.4. Had to upgrade because of those security vulnerabilities that were reported in the old version.
Here's What I'm Seeing:
- Back on 2025.3.2: Working with 2 projects, Gradle builds running, indexing happening - everything was smooth with normal memory usage
-
Now on 2026.1.4 & 2026.2: Same 2 projects setup is eating up 13GB+ RAM and making IntelliJ crawl to a near-dead state (Example: Eating 7Gb RAM for one project)
- Interesting comparison: I tested with 10 projects open (community build version 2024.1.2) and it's using ~13.3GB RAM (screenshot attached), which actually seems more reasonable than the 2-project scenario on 2026.1.4
My Setup:
- IntelliJ IDEA version: 2026.1.4
- System RAM: 30GB
- Project type: Gradle-based large projects
- What's running: Active indexing and Gradle builds
Has anyone else experienced similar memory issues with 2026.1.4?
This seems like a regression since the same workflow was much more efficient in previous versions. Any insights would be helpful.
Thankyou.
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Yashwanth Thati Thanks for the details and the screenshot.
First, about that screenshot: the figure in Windows Task Manager is the total for the whole process group, not the IDE's Java heap. It rolls in the JVM's own overhead, native libraries, and the memory-mapped index and cache files that the OS can drop whenever it needs the RAM back, so it always sits well above the configured heap. That part is normal. It also means the 13.3 GB across 10 windows on 2024.1.2 and the 13 GB with 2 projects on 2026.1.4 are not the same measurement, so I would hold off on reading much into that comparison for now. There is some background here if you are curious: Why the IDE uses more memory than the heap.
To see where the memory actually goes on 2026.1.4, could you grab two things while the IDE is in the slow state with both projects open:
1. A memory snapshot: Help | Diagnostic Tools | Capture Memory Snapshot. This writes a .hprof file. It can contain
source code from your project, so please uplinstead of attaching it here.
2. A log archive: Help | Collect Logs and Diagnostic Data. This already includes your exact build, plugins and
versions, OS, JRE, and memory/VM options, soed to send separately.
Upload both to https://uploads.jetbrains.com and let us know the upload ID.
One question in the meantime: is the 13 GB the idea64.exe process on its own, or the combined total across all your open IntelliJ windows like in the screenshote looking at one project's footprint oreverything added together.
Once we have the snapshot and the logs we can tell whether this is a real regression in 2026.1.4 or expected load for these projects, and figure out where to go from there.