Slow operations are prohibited on EDT. See SlowOperations.assertSlowOperationsAreAllowed javadoc.

[Ivan Šachov (van800)]

https://youtrack.jetbrains.com/issue/DEXP-750735/Slow-operations-are-prohibited-on-EDT.-See-SlowOperations.assertSlowOperationsAreAllowed-javadoc.

There are automatic reports in Rider with the following stacktrace:

java.lang.Throwable: Slow operations are prohibited on EDT. See SlowOperations.assertSlowOperationsAreAllowed javadoc.
	at com.intellij.openapi.diagnostic.Logger.error(Logger.java:376)
	at com.intellij.util.SlowOperations.assertSlowOperationsAreAllowed(SlowOperations.java:101)
	at com.intellij.openapi.vfs.newvfs.persistent.FSRecordsImpl.update(FSRecordsImpl.java:718)
	at com.intellij.openapi.vfs.newvfs.persistent.PersistentFSImpl.findChildInfo(PersistentFSImpl.java:572)
	at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.findInPersistence(VirtualDirectoryImpl.java:154)
	at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.doFindChild(VirtualDirectoryImpl.java:137)
	at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.findChild(VirtualDirectoryImpl.java:83)
	at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.findChild(VirtualDirectoryImpl.java:535)
	at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.findChild(VirtualDirectoryImpl.java:51)
	at com.intellij.openapi.vfs.newvfs.VfsImplUtil.findFileByPath(VfsImplUtil.java:56)
	at com.intellij.openapi.vfs.impl.local.LocalFileSystemBase.findFileByPath(LocalFileSystemBase.java:119)
	at com.intellij.openapi.vfs.impl.VirtualFileManagerImpl.findByNioPath(VirtualFileManagerImpl.java:362)
	at com.intellij.openapi.vfs.impl.VirtualFileManagerImpl.findFileByNioPath(VirtualFileManagerImpl.java:349)
	at com.maddyhome.idea.vim.vimscript.Executor.ensureFileIsSaved(Executor.kt:122)
	at com.maddyhome.idea.vim.vimscript.Executor.executeFile(Executor.kt:107)
	at com.maddyhome.idea.vim.vimscript.model.commands.SourceCommand.processCommand(SourceCommand.kt:32)
	at com.maddyhome.idea.vim.vimscript.model.commands.Command.runCommand(Command.kt:100)
	at com.maddyhome.idea.vim.vimscript.model.commands.Command.access$runCommand(Command.kt:35)
	at com.maddyhome.idea.vim.vimscript.model.commands.Command$execute$runCommand$1.invoke(Command.kt:79)
	at com.maddyhome.idea.vim.vimscript.model.commands.Command$execute$runCommand$1.invoke(Command.kt:79)
	at com.maddyhome.idea.vim.newapi.IjVimApplication.runReadAction$lambda$5(IjVimApplication.kt:74)
	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:908)
	at com.maddyhome.idea.vim.newapi.IjVimApplication.runReadAction(IjVimApplication.kt:74)
	at com.maddyhome.idea.vim.vimscript.model.commands.Command.execute(Command.kt:82)
	at com.maddyhome.idea.vim.vimscript.Executor.execute(Executor.kt:53)
	at com.maddyhome.idea.vim.api.VimscriptExecutor.execute$default(VimscriptExecutor.kt:29)
	at com.maddyhome.idea.vim.vimscript.Executor.executeFile(Executor.kt:108)
	at com.maddyhome.idea.vim.api.VimscriptExecutor.executeFile$default(VimscriptExecutor.kt:38)
	at com.maddyhome.idea.vim.vimscript.services.VimRcService.executeIdeaVimRc(VimRcService.kt:137)
	at com.maddyhome.idea.vim.VimPlugin.registerIdeavimrc(VimPlugin.java:289)
	at com.maddyhome.idea.vim.VimPlugin.turnOnPlugin(VimPlugin.java:338)
	at com.intellij.util.concurrency.ContextRunnable.run(ContextRunnable.java:27)
	at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:209)
	at com.intellij.openapi.application.TransactionGuardImpl.access$100(TransactionGuardImpl.java:22)
	at com.intellij.openapi.application.TransactionGuardImpl$1.run(TransactionGuardImpl.java:191)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:857)
	at com.intellij.openapi.application.impl.ApplicationImpl$4.run(ApplicationImpl.java:477)
	at com.intellij.openapi.application.impl.RwLockHolder.runWithEnabledImplicitRead(RwLockHolder.kt:75)
	at com.intellij.openapi.application.impl.RwLockHolder.runWithImplicitRead(RwLockHolder.kt:67)
	at com.intellij.openapi.application.impl.ApplicationImpl.runWithImplicitRead(ApplicationImpl.java:1444)
	at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:82)
	at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:124)
	at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:44)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:792)
	at java.desktop/java.awt.EventQueue$3.run(EventQueue.java:739)
	at java.desktop/java.awt.EventQueue$3.run(EventQueue.java:733)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:761)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.kt:695)
	at com.intellij.ide.IdeEventQueue._dispatchEvent$lambda$12(IdeEventQueue.kt:589)
	at com.intellij.openapi.application.impl.RwLockHolder.runWithoutImplicitRead(RwLockHolder.kt:44)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:589)
	at com.intellij.ide.IdeEventQueue.access$_dispatchEvent(IdeEventQueue.kt:72)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1.compute(IdeEventQueue.kt:355)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1$1.compute(IdeEventQueue.kt:354)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:793)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1.invoke(IdeEventQueue.kt:354)
	at com.intellij.ide.IdeEventQueue$dispatchEvent$processEventRunnable$1$1.invoke(IdeEventQueue.kt:349)
	at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$1(IdeEventQueue.kt:1014)
	at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:106)
	at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:1014)
	at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$7(IdeEventQueue.kt:349)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:862)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:391)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)