I'm at my breaking point. I didn't want to upgrade to the new UI, but JetBrains forced me to do so because they dropped support for new Java versions on the old IntelliJ IDEA. The new version is just terrible—it constantly froze when running tests. Increasing the allocated memory helped, but even with an enormous amount of RAM allocated (as shown in my screenshot), it still freezes about once every ten test runs. How can I fix this? (All other solutions from the forums didn't work, except for increasing memory allocation.)

The application cannot be closed without killing the process in Task Manager.

I'm at my breaking point. I didn't want to upgrade to the new UI, but JetBrains forced me to do so because they dropped support for new Java versions on the old IntelliJ IDEA. The new version is just terrible—it constantly froze when running tests. Increasing the allocated memory helped, but even with an enormous amount of RAM allocated (as shown in my screenshot), it still freezes about once every ten test runs. How can I fix this? (All other solutions from the forums didn't work, except for increasing memory allocation.)

The application cannot be closed without killing the process in Task Manager.

• java
• intellij-idea

Share Improve this question Follow asked Mar 2 at 22:02 UZG1UZG1 7111 gold badge33 silver badges88 bronze badges 3

• 1 There's a Plugin to go back to the old UI, btw. I think it's called "Classic UI". I use it for both Pycharm and Webstorm because ya, the new UI is atrocious. – Carcigenicate Commented Mar 2 at 22:04
• @Carcigenicate , i will try it, but not as sure that will help with excluding freezing. I feel that the new idea has memory leaks and because of this all the problems with performance. (but these are just feelings, I can't prove it) – UZG1 Commented Mar 2 at 22:35
• 2 If you can reproduce failure, please submit a bug report to JetBrains. – Basil Bourque Commented Mar 3 at 7:17

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Sorted by: Reset to default 1

Classic UI plugin

You can restore the previous user-interface by installing this plugin, Classic UI. Published by JetBrains.

To quote that Marketplace page:

Provides the classic JetBrains IDE look and feel, which was used before the introduction of New UI. Includes UI layout, 3 tool window stripes and icons for IDEs and plugins. If you prefer the old-school layout and visual style, this plugin brings back that familiar look and feel.

The plugin is frequently updated, and is free of cost.

The vendor has committed to supporting this plugin at least until July 2025. But support will end eventually.