diff --git a/src/dlangide/builders/builder.d b/src/dlangide/builders/builder.d
index dc0ada7..f13213e 100644
--- a/src/dlangide/builders/builder.d
+++ b/src/dlangide/builders/builder.d
@@ -171,52 +171,3 @@ class Builder : BackgroundOperationWatcher {
     }
 }
 
-string[] splitByLines(string s) {
-    string[] res;
-    int start = 0;
-    for(int i = 0; i <= s.length; i++) {
-        if (i == s.length) {
-            if (start < i)
-                res ~= s[start .. i];
-            break;
-        }
-        if (s[i] == '\r' || s[i] == '\n') {
-            if (start < i)
-                res ~= s[start .. i];
-            start = i + 1;
-        }
-    }
-    return res;
-}
-
-string[] detectImportPathsForCompiler(string compiler) {
-    string[] res;
-    import std.process : executeShell;
-    import std.string : startsWith, indexOf;
-    import std.path : buildNormalizedPath;
-    import std.file : write, remove;
-    import dlangui.core.files;
-    try {
-        string sourcefilename = appDataPath(".dlangide") ~ PATH_DELIMITER ~ "tmp_dummy_file_to_get_import_paths.d";
-        write(sourcefilename, "import module_that_does_not_exist;\n");
-        auto ls = executeShell("\"" ~ compiler ~ "\" \"" ~ sourcefilename ~ "\"");
-        remove(sourcefilename);
-        string s = ls.output;
-        string[] lines = splitByLines(s);
-        debug Log.d("compiler output:\n", s);
-        foreach(line; lines) {
-            if (line.startsWith("import path[")) {
-                auto p = line.indexOf("] = ");
-                if (p > 0) {
-                    line = line[p + 4 .. $];
-                    string path = line.buildNormalizedPath;
-                    debug Log.d("import path found: `", line, "`");
-                    res ~= line;
-                }
-            }
-        }
-        return res;
-    } catch (Exception e) {
-        return null;
-    }
-}
diff --git a/src/dlangide/tools/d/deditortool.d b/src/dlangide/tools/d/deditortool.d
index 81445a0..797ec1b 100644
--- a/src/dlangide/tools/d/deditortool.d
+++ b/src/dlangide/tools/d/deditortool.d
@@ -45,7 +45,7 @@ class DEditorTool : EditorTool
     DCDTask _getDocCommentsTask;
     override void getDocComments(DSourceEdit editor, TextPosition caretPosition, void delegate(string[]) callback) {
         cancelGetDocComments();
-        string[] importPaths = editor.importPaths();
+        string[] importPaths = editor.importPaths(_frame.settings);
         string content = toUTF8(editor.text);
         auto byteOffset = caretPositionToByteOffset(content, caretPosition);
         if (!isAtWord(content, byteOffset))
@@ -88,7 +88,7 @@ class DEditorTool : EditorTool
     DCDTask _goToDefinitionTask;
     override void goToDefinition(DSourceEdit editor, TextPosition caretPosition) {
         cancelGoToDefinition();
-        string[] importPaths = editor.importPaths();
+        string[] importPaths = editor.importPaths(_frame.settings);
         string content = toUTF8(editor.text);
         auto byteOffset = caretPositionToByteOffset(content, caretPosition);
 
@@ -129,7 +129,7 @@ class DEditorTool : EditorTool
     DCDTask _getCompletionsTask;
     override void getCompletions(DSourceEdit editor, TextPosition caretPosition, void delegate(dstring[] completions, string[] icons, CompletionTypes type) callback) {
         cancelGetCompletions();
-        string[] importPaths = editor.importPaths();
+        string[] importPaths = editor.importPaths(_frame.settings);
 
         string content = toUTF8(editor.text);
         auto byteOffset = caretPositionToByteOffset(content, caretPosition);
diff --git a/src/dlangide/ui/dsourceedit.d b/src/dlangide/ui/dsourceedit.d
index bbc7dc4..73c081a 100644
--- a/src/dlangide/ui/dsourceedit.d
+++ b/src/dlangide/ui/dsourceedit.d
@@ -214,9 +214,9 @@ class DSourceEdit : SourceEdit, EditableContentMarksChangeListener {
     }
 
     /// returns project import paths - if file from project is opened in current editor
-    string[] importPaths() {
+    string[] importPaths(IDESettings ideSettings) {
         if (_projectSourceFile)
-            return _projectSourceFile.project.importPaths;
+            return _projectSourceFile.project.importPaths(ideSettings);
         return null;
     }
 
diff --git a/src/dlangide/ui/frame.d b/src/dlangide/ui/frame.d
index b29dc7e..d3bea5e 100644
--- a/src/dlangide/ui/frame.d
+++ b/src/dlangide/ui/frame.d
@@ -698,20 +698,20 @@ class IDEFrame : AppFrame, ProgramExecutionStatusListener, BreakpointListChangeL
         _logPanel.appendText(null, dubPath ? ("dub path: "d ~ toUTF32(dubPath) ~ "\n"d) : ("dub is not found! cannot build projects without DUB\n"d));
         _logPanel.appendText(null, rdmdPath ? ("rdmd path: "d ~ toUTF32(rdmdPath) ~ "\n"d) : ("rdmd is not found!\n"d));
         _logPanel.appendText(null, dmdPath ? ("dmd path: "d ~ toUTF32(dmdPath) ~ "\n"d) : ("dmd compiler is not found!\n"d));
-        dumpCompilerPath("DMD", dmdPath);
+        dumpCompilerPath("dmd", dmdPath);
         _logPanel.appendText(null, ldcPath ? ("ldc path: "d ~ toUTF32(ldcPath) ~ "\n"d) : ("ldc compiler is not found!\n"d));
-        dumpCompilerPath("LDC", ldcPath);
+        dumpCompilerPath("ldc", ldcPath);
         _logPanel.appendText(null, gdcPath ? ("gdc path: "d ~ toUTF32(gdcPath) ~ "\n"d) : ("gdc compiler is not found!\n"d));
-        dumpCompilerPath("GDC", gdcPath);
+        dumpCompilerPath("gdc", gdcPath);
     }
-    private void dumpCompilerPath(dstring compilerName, string compiler) {
+    private void dumpCompilerPath(string compilerName, string compiler) {
         if (!compiler)
             return;
         if (compiler) {
-            string[] imports = detectImportPathsForCompiler(compiler);
+            string[] imports = compilerImportPathsCache.getImportPathsFor(compilerName);
             if (imports.length > 0) {
                 Log.d(compilerName, " imports:", imports);
-                _logPanel.appendText(null, compilerName ~ " imports:\n"d);
+                _logPanel.appendText(null, to!dstring(compilerName) ~ " imports:\n"d);
                 foreach(s; imports)
                     _logPanel.appendText(null, "    "d ~ to!dstring(s) ~ "\n"d);
             }
@@ -1601,7 +1601,7 @@ class IDEFrame : AppFrame, ProgramExecutionStatusListener, BreakpointListChangeL
     }
 
     public void warmUpImportPaths(Project project) {
-        dcdInterface.warmUp(project.importPaths);
+        dcdInterface.warmUp(project.importPaths(_settings));
     }
 
     void restoreListOfOpenedFiles() {
diff --git a/src/dlangide/workspace/project.d b/src/dlangide/workspace/project.d
index 5950295..ddf8550 100644
--- a/src/dlangide/workspace/project.d
+++ b/src/dlangide/workspace/project.d
@@ -305,29 +305,6 @@ class WorkspaceItem {
     }
 }
 
-/// detect DMD source paths
-string[] dmdSourcePaths() {
-    string[] res;
-
-	if(!includePath.empty){
-		res ~= includePath;
-	}
-
-    version(Windows) {
-        import dlangui.core.files;
-        string dmdPath = findExecutablePath("dmd");
-        if (dmdPath) {
-            string dmdDir = buildNormalizedPath(dirName(dmdPath), "..", "..", "src");
-            res ~= absolutePath(buildNormalizedPath(dmdDir, "druntime", "import"));
-            res ~= absolutePath(buildNormalizedPath(dmdDir, "phobos"));
-        }
-    } else {
-        res ~= "/usr/include/dmd/druntime/import";
-        res ~= "/usr/include/dmd/phobos";
-    }
-    return res;
-}
-
 /// Stores info about project configuration
 struct ProjectConfiguration {
     /// name used to build the project
@@ -384,6 +361,7 @@ struct ProjectConfiguration {
 
 /// DLANGIDE D project
 class Project : WorkspaceItem {
+    import dlangide.workspace.idesettings : IDESettings;
     protected Workspace _workspace;
     protected bool _opened;
     protected ProjectFolder _items;
@@ -397,7 +375,6 @@ class Project : WorkspaceItem {
     protected string _dependencyVersion;
 
     protected string[] _sourcePaths;
-    protected string[] _builderSourcePaths;
     protected ProjectConfiguration[] _configurations;
     protected ProjectConfiguration _projectConfiguration = ProjectConfiguration.DEFAULT;
 
@@ -529,12 +506,12 @@ class Project : WorkspaceItem {
 
     /// returns project's own source paths
     @property string[] sourcePaths() { return _sourcePaths; }
-    /// returns project's own source paths
-    @property string[] builderSourcePaths() { 
-        if (!_builderSourcePaths) {
-            _builderSourcePaths = dmdSourcePaths();
-        }
-        return _builderSourcePaths; 
+    /// returns project's current toolchain import paths
+    string[] builderSourcePaths(IDESettings ideSettings) {
+        string compilerName = settings.getToolchain(ideSettings);
+        if (!compilerName)
+            compilerName = "default";
+        return compilerImportPathsCache.getImportPathsFor(compilerName);
     }
 
     /// returns first source folder for project or null if not found
@@ -556,10 +533,10 @@ class Project : WorkspaceItem {
                 dst ~= item;
         }
     }
-    @property string[] importPaths() {
+    @property string[] importPaths(IDESettings ideSettings) {
         string[] res;
         addUnique(res, sourcePaths);
-        addUnique(res, builderSourcePaths);
+        addUnique(res, builderSourcePaths(ideSettings));
         foreach(dep; _dependencies) {
             addUnique(res, dep.sourcePaths);
         }
@@ -805,7 +782,7 @@ class Project : WorkspaceItem {
             findMainSourceFile();
 
             Log.i("Project source paths: ", sourcePaths);
-            Log.i("Builder source paths: ", builderSourcePaths);
+            //Log.i("Builder source paths: ", builderSourcePaths(_settings));
             if (!_isDependency)
                 loadSelections();
 
@@ -1003,3 +980,99 @@ class EditorBookmark {
     int line;
     string projectName;
 }
+
+
+string[] splitByLines(string s) {
+    string[] res;
+    int start = 0;
+    for(int i = 0; i <= s.length; i++) {
+        if (i == s.length) {
+            if (start < i)
+                res ~= s[start .. i];
+            break;
+        }
+        if (s[i] == '\r' || s[i] == '\n') {
+            if (start < i)
+                res ~= s[start .. i];
+            start = i + 1;
+        }
+    }
+    return res;
+}
+
+struct CompilerImportPathsCache {
+
+    private static class Entry {
+        string[] list;
+    }
+    private Entry[string] _cache;
+
+    string[] getImportPathsFor(string compiler) {
+        import dlangui.core.files : findExecutablePath;
+        if (!compiler.length)
+            return [];
+        if (auto p = compiler in _cache) {
+            // found in cache
+            return p.list;
+        }
+        Log.d("Searching for compiler path: ", compiler);
+        import std.path : isAbsolute;
+        string compilerPath = compiler;
+        if (compiler == "default") {
+            // try to autodetect default compiler
+            compilerPath = findExecutablePath("dmd");
+            if (!compilerPath)
+                compilerPath = findExecutablePath("ldc");
+            if (!compilerPath)
+                compilerPath = findExecutablePath("gdc");
+        } else if (compilerPath && !compilerPath.isAbsolute)
+            compilerPath = findExecutablePath(compiler);
+        string[] res;
+        if (compilerPath)
+            res = detectImportPathsForCompiler(compilerPath);
+        else
+            Log.w("Compiler executable not found for `", compiler, "`");
+        Entry newItem = new Entry();
+        newItem.list = res;
+        _cache[compiler] = newItem;
+        return res;
+    }
+}
+
+__gshared CompilerImportPathsCache compilerImportPathsCache;
+
+string[] detectImportPathsForCompiler(string compiler) {
+    string[] res;
+    import std.process : pipeProcess, Redirect, wait;
+    import std.string : startsWith, indexOf;
+    import std.path : buildNormalizedPath;
+    import std.file : write, remove;
+    import dlangui.core.files;
+    try {
+        string sourcefilename = appDataPath(".dlangide") ~ PATH_DELIMITER ~ "tmp_dummy_file_to_get_import_paths.d";
+        write(sourcefilename, "import module_that_does_not_exist;\n");
+        auto pipes = pipeProcess([compiler, sourcefilename], Redirect.stdin | Redirect.stdout | Redirect.stderrToStdout, null, Config.suppressConsole);
+        char[4096] buffer;
+        char[] s = pipes.stdout.rawRead(buffer);
+        wait(pipes.pid);
+        //auto ls = execute([compiler, sourcefilename]);
+        remove(sourcefilename);
+        //string s = ls.output;
+        string[] lines = splitByLines(cast(string)s);
+        debug Log.d("compiler output:\n", s);
+        foreach(line; lines) {
+            if (line.startsWith("import path[")) {
+                auto p = line.indexOf("] = ");
+                if (p > 0) {
+                    line = line[p + 4 .. $];
+                    string path = line.buildNormalizedPath;
+                    debug Log.d("import path found: `", path, "`");
+                    res ~= path;
+                }
+            }
+        }
+        return res;
+    } catch (Exception e) {
+        return null;
+    }
+}