Copilot IntelliJ plugin using 100% CPU #154926
Replies: 16 comments · 12 replies
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I understand that not all issues can be immediately investigated by the product team, but it's been nigh on 5 months without any response. This is a very real and problematic issue for a lot of people, this chat window occupies all 20 cores of my workstation and frequently causes all my peripherals to lock up. |
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yeah, i also observer this. it looks like they are used my hardware to mine some coins... |
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I've been experiencing the same for ~8 months. The 2 ways to circumvent this I found so far are:
In case it matters, I'm working on a TS project using IntelliJ Ultimate (Build #IU-243.26053.27, built on March 16, 2025) on a Mac M2. I had the same with all versions of intellij ultimate + copilot plugin in the last few months. |
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any news? that's frustrating... it looks like any JetBrains IDE suffers from this . I see this in WebStorm... Windows / Ubuntu - does not matter. |
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This issue seems to be caused/triggered by the size of your AI Agent session. I accumulated a fairly large AI context and never bothered to create a new Agent Session. Once I did (Press |
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Incorrect, can happen on new small chat sessions with code blocks in the history. |
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@conor888 My apologies. Your are right. Just learned this the hard as my mac got uncomfortably hot. However, initially, at least right after clicking |
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any fix? |
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I experience this behavior as well. How can a chat window in IntelliJ take so many resources? |
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Also experiencing this. Up to date with the latest versions of Copilot and IntelliJ. Who should I send the invoice to for the extra power consumption I'm incurring? |
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Possible Causes & Fixes for 100% CPU in Copilot IntelliJ Plugin I’ve seen similar high CPU issues with the Copilot IntelliJ plugin. Here are some things that usually help: Update Copilot & IntelliJ Make sure you’re running the latest versions of both IntelliJ and the Copilot plugin. Older versions (esp. 2024.x builds) had memory leaks and indexing issues. Updating often fixes CPU spikes. Disable Background Indexing / Plugins Go to Settings > Plugins and temporarily disable heavy plugins (e.g., Lombok, SonarLint, etc.). Some plugins clash with Copilot’s real-time code suggestion process. Limit Copilot’s Context Window In Settings > GitHub Copilot, reduce the context length or disable inline suggestions in very large projects. Copilot tries to parse huge files and can hog CPU. Check for Known Bug Reports GitHub Copilot IntelliJ Issues Example issue: “Copilot plugin CPU usage spike on project load”. Workaround Until Fix Disable Copilot temporarily (Ctrl+Shift+A → Copilot: Disable) when you don’t need suggestions. Restarting IntelliJ clears runaway Copilot threads if CPU stays locked. Provide Logs to GitHub Go to Help > Collect Logs and Diagnostic Data and attach them when reporting. It helps maintainers reproduce and patch the bug faster. |
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Experiencing this as well. With copilot panel closed: With copilot panel open: |
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Same for me - High CPU usage when opening the GitHub Copilot "Chat" window only. Inline suggestions works fine without much issue, everything at latest versions. |
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I'm having the same problem under MacOS latest version (MBA apple silicon M3) , phpStorm 2025.2 and copilot updated. If I open the copilot panel cpu goes crazy.. With copilot panel closed With copilot panel open |
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The same problem occurs: if the Copilot window is open, WebStorm starts consuming 100% of the CPU. |
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Same situation here (PhpStorm 2025.2.1) when I open Copilot Chat, CPU usage goes to 100%. |
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I had to downgrade to phpstorm 2024.1 from July to allow use copilot.
I did the same with IntelliJ, webstorm and others.
Finally, now is running fine again!!!!
I’ll wait some fix to allow upgrade later.
My MBA m3 was getting too hot
I notice this problem also using Gemini. I think that is some problem in Jetbrain IDEs.
Regards,
Manuel Pardo
… Em 3 de set. de 2025, à(s) 06:13, Admir Ljubijankić ***@***.***> escreveu:
Same situation here (PhpStorm 2025.2.1) when I open Copilot Chat, CPU usage goes to 100%.
Current work around that helps, but is very annoying to use, is to enable "power save mode" and then open the Copilot Chat. Looks like PhpStorm is trying to analyse the code suggestions in the Copilot Chat.
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We absolutely need a fix for this, it's been going on for months. |
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Seeing this now too on WebStorm 2025.2 with Copilot plugin 1.5.55-243, using 500% CPU with the GitHub Copilot panel open, goes back down to 5% CPU as soon as I close the panel |
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I experienced the same issue. However, after reinstalling the IDE, the CPU usage dropped from over 500% to around 40% max when using the Copilot Chat window. Hopefully this information is helpful. |
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I didn’t try it.
Someone can confirm?
In today's update, they seem to fix the issue, I updated the latest version of the plugin 1.5.55-243 ，and my mac CPU usage issue has been resolved
Is this working in 1.5.55-243?
I did a downgrade in phpstorm, webstorm to 2024.1 from July to allow use copilot with success.
Regards,
Manuel Pardo
… Em 4 de set. de 2025, à(s) 21:52, ssggiitt ***@***.***> escreveu:
In today's update, they seem to fix the issue, I updated the latest version of the plugin 1.5.55-243 ，and my mac CPU usage issue has been resolved
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No, it didn't. I've updated both PhpStorm (the issue is happening across all JetBrains IDEs) and the Copilot plugin. And the problem is still happening. From my testing, it's something related to the IDE and not the plugin, since if I go into power saving mode, it works fine; it's just very annoying to switch power saving on and off all the time. |
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My phpstorm was on 900%+ cpu usage on my m4 macbook whenever I had github copilot chat window opened. This issue seems to be on version 2025.2.1. I downgraded to my phpstorm to version 2025.1.5.1 and it works completely fine and my phpstorm is on 30-40% cpu usage. So to fix this is to just downgrade to version 2025.1.5.1 |
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I logged an issue: https://intellij-support.jetbrains.com/hc/en-us/requests/8022397?page=1 I found that minimizing CoPilot window lets CPU cool down. Even if in the background there is an ongoing conversation. Would you please vote up this one:
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At first I observed the same behavior when minimizing the window / hiding the plugin panel - when it lost focus the CPU usage dropped. What did resolve the situation for me now was the deletion of conversation history. I noticed then that when in Ask mode and the plugins response contained some formatted code snippet, the CPU usage immediatelly jumped up and it stayed that way whenever I returned back to plugin panel / window. |
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In fact I noticed that using gemini in JetBrain IDEs the problem also is happening. The cpu consume is lower than copilot, but also cpu goes crazy.
So I think the problem it seems in JetBrain…
Does someone noticed this in Gemini plugin while using in JetBrains?
… Em 24 de set. de 2025, à(s) 14:53, Andrii Bezuglyi ***@***.***> escreveu:
I logged an issue: https://intellij-support.jetbrains.com/hc/en-us/requests/8022397?page=1
JetBrains do not want to bother - they are saying that it is problem with plugin (who would doubt they would say that).
I found that minimizing CoPilot window lets CPU cool down. Even if in the background there is an ongoing conversation.
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Same issue |
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I am using the latest version of the Copilot IntelliJ plugin in CachyOS and the CPU usage quickly goes to 100% and never goes down. I tried with IntelliJ 2025.1 Beta, IntelliJ 2024.3 and IntelliJ 2024.2 and the results are similar. Sometimes CPU usage goes to 100% as soon as I open IntelliJ, and sometimes after I have used it for a few minutes. See images below.
I am happy to provide any other information if that helps.
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