How to fix The file size exceeds the configured limit (2.56 MB). Code insight features are not available.

Question

When opening a large code file in the JetBrains IDE, it complains at the top of the editor:

The file size exceeds the configured limit (2.56 MB). Code insight features are not available.

How to fix it?

Answer

For performance and memory consumption reasons, JetBrains IDEs set the following file size limits:

• The maximum size for files that JetBrains IDEs can open, is controlled by the idea.max.content.load.filesize IDE property. The default value is 20000 kilobytes (20MB).
• The maximum size for files where JetBrains IDEs enable coding assistance, is controlled by the idea.max.intellisense.filesize property. The default value is 2500 kilobytes.
• The maximum size for large files that JetBrains IDEs can open, is controlled by the idea.max.content.load.large.preview.size IDE property. The default value is 2500 kilobytes.

Change the file size limits in IDE properties

1. Do one of the following:

   • Select Help | Edit Custom Properties from the main menu.
   • On the Welcome screen, click Configure and then select Edit Custom Properties.
   • If you cannot start JetBrains IDEs, you can manually create an empty idea.properties file in the JetBrains IDEs configuration directory.

2. In the custom idea.properties file that opens in a new editor tab, specify the desired values in kilobytes, for example:

   # Maximum file size (kilobytes) IDE should provide code assistance for.
   idea.max.intellisense.filesize=60000
   
   # Maximum file size (kilobytes) IDE can open.
   idea.max.content.load.filesize=60000
   
   # Maximum large file size (kilobytes) IDE can open.
   idea.max.content.load.large.preview.size=80000
   

   The properties you add to this file override the corresponding default properties.

3. Restart the IDE.

These settings are also applied to JetBrains Gateway.

Ref:

https://www.jetbrains.com/help/rider/Configuring_File_Size_Limit.html