Slow operations in EDT

[KUGDev]

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:114)
at com.intellij.openapi.vfs.impl.local.LocalFileSystemBase.convertToNioFileAndCheck(LocalFileSystemBase.java:83)
at com.intellij.openapi.vfs.impl.local.LocalFileSystemBase.getInputStream(LocalFileSystemBase.java:344)
at com.intellij.openapi.vfs.newvfs.persistent.PersistentFSImpl.getInputStream(PersistentFSImpl.java:896)
at com.intellij.openapi.vfs.newvfs.impl.VirtualFileImpl.getInputStream(VirtualFileImpl.java:101)
at org.zowe.explorer.zowe.service.ZoweConfigServiceImpl.scanForZoweConfig(ZoweConfigServiceImpl.kt:133)
at org.zowe.explorer.zowe.service.ZoweConfigServiceImpl.getZoweConfigState(ZoweConfigServiceImpl.kt:474)
at org.zowe.explorer.zowe.service.ZoweConfigService$DefaultImpls.getZoweConfigState$default(ZoweConfigService.kt:78)
at org.zowe.explorer.zowe.ZoweStartupActivityKt.showNotificationForAddUpdateZoweConfigIfNeeded(ZoweStartupActivity.kt:43)
at org.zowe.explorer.zowe.ZoweStartupActivity.runActivity(ZoweStartupActivity.kt:116)
at com.intellij.ide.startup.impl.StartupManagerImpl.runOldActivity(StartupManagerImpl.kt:340)
at com.intellij.ide.startup.impl.StartupManagerImpl.runPostStartupActivities$lambda$6$lambda$5(StartupManagerImpl.kt:301)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:101)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:101)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:107)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:101)
at com.intellij.util.concurrency.ContextRunnable.run(ContextRunnable.java:27)
at com.intellij.openapi.project.SmartModeScheduler.addLast$lambda$1(SmartModeScheduler.kt:81)
at com.intellij.openapi.project.SmartModeScheduler.addLast$lambda$2(SmartModeScheduler.kt:81)
at com.intellij.openapi.project.SmartModeScheduler$RunnableDelegate.run(SmartModeScheduler.kt:42)
at com.intellij.openapi.project.SmartModeScheduler.doRun(SmartModeScheduler.kt:124)
at com.intellij.openapi.project.SmartModeScheduler.runAllWhileSmart(SmartModeScheduler.kt:116)
at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:236)
at com.intellij.openapi.application.TransactionGuardImpl.access$100(TransactionGuardImpl.java:25)
at com.intellij.openapi.application.TransactionGuardImpl$1.run(TransactionGuardImpl.java:198)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runIntendedWriteActionOnCurrentThread$lambda$2(AnyThreadWriteThreadingSupport.kt:217)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:128)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runIntendedWriteActionOnCurrentThread(AnyThreadWriteThreadingSupport.kt:216)
at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:842)
at com.intellij.openapi.application.impl.ApplicationImpl$2.run(ApplicationImpl.java:421)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:101)
at com.intellij.util.concurrency.ChildContext$runInChildContext$1.invoke(propagation.kt:101)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:107)
at com.intellij.util.concurrency.ChildContext.runInChildContext(propagation.kt:101)
at com.intellij.util.concurrency.ContextRunnable.run(ContextRunnable.java:27)
at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:117)
at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:43)
at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:781)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:728)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:750)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.kt:675)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:573)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$18$lambda$17$lambda$16$lambda$15(IdeEventQueue.kt:355)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:857)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$18$lambda$17$lambda$16(IdeEventQueue.kt:354)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$2$lambda$1(IdeEventQueue.kt:1045)
at com.intellij.openapi.application.WriteIntentReadAction.lambda$run$0(WriteIntentReadAction.java:24)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:128)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteIntentReadAction(ApplicationImpl.java:916)
at com.intellij.openapi.application.WriteIntentReadAction.compute(WriteIntentReadAction.java:55)
at com.intellij.openapi.application.WriteIntentReadAction.run(WriteIntentReadAction.java:23)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$2(IdeEventQueue.kt:1045)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$3(IdeEventQueue.kt:1054)
at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:109)
at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:1054)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$18(IdeEventQueue.kt:349)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:395)
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)

[ktsytsen]

@Ivsh312 Could you please test.

How to reproduce:
On the latest IDE (243) create huge json conf file (eg. >22Mb) and check the problem doesn't occur.