Severe performance regression on IntelliJ 2026.1 / Windows 11 — language_server_windows_x64 high CPU usage, freezes, very slow refactoring

[xorgxx]

Title: Severe performance regression on IntelliJ 2026.1 / Windows 11 — language_server_windows_x64 high CPU usage, freezes, very slow refactoring

Summary

I would like to report a major malfunction that I have been experiencing for several days with the JetBrains plugin.

The process language_server_windows_x64 is now consuming an excessive amount of system resources, reaching more than 80% of total system usage. This behavior did not occur before.

As a result, the IDE becomes extremely slow and can sometimes freeze completely.

In parallel, processing times have become abnormally long. Even a simple refactoring operation can take between 30 minutes and 1 hour, which makes the tool very difficult to use on a daily basis.

I am also noticing what appears to be disproportionate token/credit usage, while the overall quality of service has significantly degraded.

Environment

• IDE: IntelliJ IDEA
• Build: IU-261.22158.277
• Build date: March 25, 2026
• OS: Windows 11 Pro 22H2
• OS build: 22621.4317
• Windows Feature Experience Pack: 1000.22700.1041.0
• CPU: Intel(R) Core(TM) i5-5300U CPU @ 2.30 GHz
• RAM: 16 GB
• Architecture: 64-bit OS, x64-based processor

Observed behavior

• language_server_windows_x64 uses an excessive amount of CPU/resources
• severe IDE slowdowns
• occasional full system freezes
• refactoring tasks can take 30 to 60 minutes
• token/credit consumption seems abnormally high compared to the work actually completed

Expected behavior

• normal CPU/resource usage
• responsive editing and refactoring
• no system freezes
• processing times consistent with previous versions / normal usage
• token/credit consumption proportional to actual work performed

Impact

This issue makes the plugin extremely difficult to use in a professional daily workflow.

Request

Please investigate this regression and identify the root cause as soon as possible.

If needed, I can also provide additional logs, stack traces, or reproduction details.

Not found: an internal error occurred (error ID: b5de0d4b6eaa4530912e877ebc4dada8) (trace ID: c31b2dfe15e380c73ac2ab4932867a70)

[xorgxx]

Now it doesn’t work at all. I think this plugin is neither reliable nor stable.

[xorgxx]

The project shows promise and is based on a good idea, but it still requires time to reach maturity. At its current stage, it contains many bugs and frequent system changes, which impact productivity. Unfortunately, these issues are ultimately borne by the client, both in terms of time and cost. This raises concerns about the company’s approach, where the financial burden tends to fall on the customer rather than being absorbed internally.

In addition, it is nearly impossible to reach any real support. There is no direct contact available, and responses are either nonexistent or limited to an AI that provides only vague and unhelpful answers.