diff --git a/CHANGELOG.md b/CHANGELOG.md
index 726a95b..5b3695e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,9 +8,10 @@
 
 ### Acknowledge undefined action inputs & outputs
 
-- Fix: Keep user settings after action refresh
 - Feat: [#33 Acknowledge undefined action inputs & outputs](https://github.com/YunaBraska/github-workflow-plugin/issues/33)
 - Feat: Click on `Needs` navigates directly to the `Job`
+- Fix: [Startup error: Slow operations are prohibited on EDT](https://github.com/YunaBraska/github-workflow-plugin/issues/38)
+- Fix: Keep user settings after action refresh
 - Chore: refactored & split logic to specific classes
   like \[`Action`, `Envs`, `GitHub`, `Inputs`, `Jobs`, `Needs`, `Runner`, `Secrets`, `Steps`]
 
diff --git a/src/main/java/com/github/yunabraska/githubworkflow/services/ProjectStartup.java b/src/main/java/com/github/yunabraska/githubworkflow/services/ProjectStartup.java
index 3e74cbe..8087347 100644
--- a/src/main/java/com/github/yunabraska/githubworkflow/services/ProjectStartup.java
+++ b/src/main/java/com/github/yunabraska/githubworkflow/services/ProjectStartup.java
@@ -89,17 +89,25 @@ public static void asyncInitAllActionsAfterInit(final Project project, final Vir
     }
 
     private static void asyncInitAllActions(final Project project, final VirtualFile virtualFile) {
-        if (virtualFile != null && (GitHubWorkflowHelper.isWorkflowPath(toPath(virtualFile.getPath())))) {
-            final List<GitHubAction> actions = new ArrayList<>();
-            // READ CONTEXT
-            ApplicationManager.getApplication().runReadAction(() -> Optional.of(PsiManager.getInstance(project))
-                    .map(psiManager -> psiManager.findFile(virtualFile))
-                    .map(psiFile -> PsiElementHelper.getAllElements(psiFile, FIELD_USES))
-                    .ifPresent(usesList -> usesList.stream().map(GitHubActionCache::getAction).filter(action -> !action.isSuppressed()).filter(action -> !action.isResolved()).forEach(actions::add))
-            );
-
-            // ASYNC HTTP CONTEXT
-            GitHubActionCache.resolveActionsAsync(actions);
+        final Runnable task = () -> {
+            if (virtualFile != null && (GitHubWorkflowHelper.isWorkflowPath(toPath(virtualFile.getPath())))) {
+                final List<GitHubAction> actions = new ArrayList<>();
+                // READ CONTEXT
+                ApplicationManager.getApplication().runReadAction(() -> Optional.of(PsiManager.getInstance(project))
+                        .map(psiManager -> psiManager.findFile(virtualFile))
+                        .map(psiFile -> PsiElementHelper.getAllElements(psiFile, FIELD_USES))
+                        .ifPresent(usesList -> usesList.stream().map(GitHubActionCache::getAction).filter(action -> !action.isSuppressed()).filter(action -> !action.isResolved()).forEach(actions::add))
+                );
+
+                // ASYNC HTTP CONTEXT
+                GitHubActionCache.resolveActionsAsync(actions);
+            }
+        };
+
+        if (!DumbService.isDumb(project)) {
+            ApplicationManager.getApplication().executeOnPooledThread(task);
+        } else {
+            DumbService.getInstance(project).runWhenSmart(() -> ApplicationManager.getApplication().executeOnPooledThread(task));
         }
     }
 }