copilot-language-server is consuming an enormous amount of resources.

[yzakharuk-iqmessenger]

Feedback source

None

GitHub Copilot plugin version

1.8.2-243

JetBrains IDE and version

IntelliJ IDEA 2026.1.1

Platform

Ubuntu Linux 25.10, uname -a output: Linux Slavik-PC 6.17.0-22-generic #22-Ubuntu SMP PREEMPT_DYNAMIC Fri Mar 13 12:04:44 UTC 2026 x86_64 GNU/Linux

Steps to reproduce

Open the IDE with the project.

Logs (optional)

No response

Expected behavior

The plugin uses a reasonable amount of resources.

Actual behavior

copilot-language-server starts consuming all available CPU resources and more than 20G of RAM.

Additional information

The project is a multi-module monolith with over 150 modules and more than 300K lines of code (Java, TypeScript, and others). As far as I can see (using strace and pstree), copilot-language-server is opening project files in bulk and calling git. Team colleges using IntelliJ IDEA on Windows have a similar issue after updating the plugin. 1.7.1-242 version works OK.
If this matters, the account I'm using with the Copilot plug-in is a part of the GitHub Copilot Business subscription.

[wcole3]

Experiencing the same in similar multi-module monolith. Large CPU usage during startup and then ~ 50% system ram usage while idle (32gb). Observed on Windows version 25H2 (build: 26200.8246), IDEA Build #IU-261.23567.138, Copilot plugin version 1.8.2.243.

[vsydorchuk-iqmessenger]

Confirm the issue. Once you open IntelliJ IDEA, CPU gets 100% load by copilot-language-server process, 100% of RAM is used, RAM is dumped to HDD exhausting free space in an extremely fast manner, after 2-3 minutes of intense load IDEA just crashes.
OS: Windows 10 22H2. IntelliJ IDEA 2026.1.1, Build #IU-261.23567.138, built on April 23, 2026. Copilot plugin version: 1.8.2-243

[jiec-msft]

@yzakharuk-iqmessenger @wcole3 @vsydorchuk-iqmessenger Hi guys, I failed to reproduce the issue with this huge mono repo: http://github.com/jetbrains/intellij-community and I also created a public repo with 150 modules: https://github.com/ghc-jetbrains/multi-module-monolith-fixture

Not sure if related to some feature flag things. Would you help to try these projects and share the verbose
idea*.log files (i.e. idea.log and the rotated idea.1.log ... idea.9.log)?

[jiec-msft]

Okay, now I reproduced it with this repo: https://github.com/ghc-jetbrains/multi-workspace-folder-fixture

[joshuataylor]

Also posted github/CopilotForXcode#306 and https://github.com/orgs/community/discussions/84695 best of luck.

[jiec-msft]

@joshuataylor Thanks for sharing the traces back. A first analysis is that IntelliJ submodules have triggered indexing within Copilot plugin.

Invite @SLdragon @testforstephen for further check.