diff --git a/src/dlangide/tools/d/dcdinterface.d b/src/dlangide/tools/d/dcdinterface.d
index c465825..4392bb4 100644
--- a/src/dlangide/tools/d/dcdinterface.d
+++ b/src/dlangide/tools/d/dcdinterface.d
@@ -72,11 +72,14 @@ class DCDTask {
         if (_cancelled)
             return;
         createRequest();
+        if (_cancelled)
+            return;
         performRequest();
         synchronized(this) {
             if (_cancelled)
                 return;
-            _guiExecutor.executeInUiThread(&postResults);
+            if (_guiExecutor)
+                _guiExecutor.executeInUiThread(&postResults);
         }
     }
 }
@@ -183,6 +186,29 @@ class DCDInterface : Thread {
         return "";
     }
 
+    /// DCD doc comments task
+    class ModuleCacheWarmupTask : DCDTask {
+
+        this(CustomEventTarget guiExecutor, string[] importPaths) {
+            super(guiExecutor, importPaths, null, null, 0);
+        }
+
+        override void performRequest() {
+            debug(DCD) Log.d("DCD - warm up module cache with import paths ", _importPaths);
+            getModuleCache(_importPaths);
+            debug(DCD) Log.d("DCD - module cache warm up finished");
+        }
+        override void postResults() {
+        }
+    }
+
+    DCDTask warmUp(string[] importPaths) {
+        debug(DCD) Log.d("DCD warmUp: ", importPaths);
+        ModuleCacheWarmupTask task = new ModuleCacheWarmupTask(null, importPaths);
+        _queue.put(task);
+        return task;
+    }
+
     /// DCD doc comments task
     class DocCommentsTask : DCDTask {
 
diff --git a/src/dlangide/tools/d/deditortool.d b/src/dlangide/tools/d/deditortool.d
index bde0927..c3bfbeb 100644
--- a/src/dlangide/tools/d/deditortool.d
+++ b/src/dlangide/tools/d/deditortool.d
@@ -63,6 +63,7 @@ class DEditorTool : EditorTool
 
     override void cancelGetDocComments() {
         if (_getDocCommentsTask) {
+            Log.d("Cancelling getDocComments()");
             _getDocCommentsTask.cancel();
             _getDocCommentsTask = null;
         }
@@ -70,6 +71,7 @@ class DEditorTool : EditorTool
 
     override void cancelGoToDefinition() {
         if (_goToDefinitionTask) {
+            Log.d("Cancelling goToDefinition()");
             _goToDefinitionTask.cancel();
             _goToDefinitionTask = null;
         }
@@ -77,6 +79,7 @@ class DEditorTool : EditorTool
 
     override void cancelGetCompletions() {
         if (_getCompletionsTask) {
+            Log.d("Cancelling getCompletions()");
             _getCompletionsTask.cancel();
             _getCompletionsTask = null;
         }
@@ -125,6 +128,7 @@ class DEditorTool : EditorTool
 
     DCDTask _getCompletionsTask;
     override void getCompletions(DSourceEdit editor, TextPosition caretPosition, void delegate(dstring[] completions, string[] icons) callback) {
+        cancelGetCompletions();
         string[] importPaths = editor.importPaths();
 
         string content = toUTF8(editor.text);
diff --git a/src/dlangide/ui/frame.d b/src/dlangide/ui/frame.d
index ca65b90..66efa96 100644
--- a/src/dlangide/ui/frame.d
+++ b/src/dlangide/ui/frame.d
@@ -1325,6 +1325,7 @@ class IDEFrame : AppFrame, ProgramExecutionStatusListener, BreakpointListChangeL
         if (!project)
             return;
         currentWorkspace.startupProject = project;
+        warmUpImportPaths(project);
         if (_wsPanel)
             _wsPanel.updateDefault();
     }
@@ -1394,15 +1395,21 @@ class IDEFrame : AppFrame, ProgramExecutionStatusListener, BreakpointListChangeL
         }
         const auto msg = UIString.fromId("MSG_OPENED_PROJECT"c);
         _logPanel.logLine(toUTF32("Project file " ~ project.filename ~  " is opened ok"));
+        
+        warmUpImportPaths(project);
         return true;
     }
 
+    public void warmUpImportPaths(Project project) {
+        dcdInterface.warmUp(project.importPaths);
+    }
+
     void openFileOrWorkspace(string filename) {
         // Open DlangIDE workspace file
         if (filename.isWorkspaceFile) {
             Workspace ws = new Workspace(this);
             if (ws.load(filename)) {
-                    askForUnsavedEdits(delegate() {
+                askForUnsavedEdits(delegate() {
                     setWorkspace(ws);
                     hideHomeScreen();
                     // Write workspace to recent workspaces list
@@ -1421,9 +1428,9 @@ class IDEFrame : AppFrame, ProgramExecutionStatusListener, BreakpointListChangeL
             const auto msg = UIString.fromId("MSG_TRY_OPEN_PROJECT"c).value;
             _logPanel.logLine(msg ~ toUTF32(" " ~ filename));
             Project project = new Project(currentWorkspace, filename);
-            if (!project.load()) {
-                window.showMessageBox(UIString.fromId("MSG_OPEN_PROJECT"c), UIString.fromId("ERROR_INVALID_WS_OR_PROJECT_FILE"c));
-                _logPanel.logLine("File is not recognized as DlangIDE project or workspace file");
+            if (!loadProject(project)) {
+                //window.showMessageBox(UIString.fromId("MSG_OPEN_PROJECT"c), UIString.fromId("ERROR_INVALID_WS_OR_PROJECT_FILE"c));
+                //_logPanel.logLine("File is not recognized as DlangIDE project or workspace file");
                 return;
             }
             string defWsFile = project.defWorkspaceFile;
@@ -1508,6 +1515,9 @@ class IDEFrame : AppFrame, ProgramExecutionStatusListener, BreakpointListChangeL
             _wsPanel.visibility = Visibility.Visible;
             _settings.updateRecentWorkspace(ws.filename);
             _settings.setRecentPath(ws.dir, "FILE_OPEN_WORKSPACE_PATH");
+            if (ws.startupProject) {
+                warmUpImportPaths(ws.startupProject);
+            }
         } else {
             _wsPanel.visibility = Visibility.Gone;
         }