An error has occurred in SonarLint for IntelliJ, which prevented the configuration from being properly saved.
This has been fixed in the latest version 2.3.2: https://jira.sonarsource.com/browse/SLI-106
About performance, please make sure that you are using Java 4.2 analyzer, as you may encounter this problem: https://jira.sonarsource.com/browse/SLI-100 .
It is built into the latest SonarLint, but if you use the connected mode, you also need to check which version of the Java analyzer is installed on the SonarQube server.
We always try to increase productivity, so do not hesitate to open a topic in the SonarLint Google group using the detailed analysis log so that we can investigate why it takes so long to analyze the file.
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