diff --git a/src/compiler/path.ts b/src/compiler/path.ts
index d7d8d964d542b..a550e1a0e9b57 100644
--- a/src/compiler/path.ts
+++ b/src/compiler/path.ts
@@ -852,4 +852,8 @@ namespace ts {
             directory = parentPath;
         }
     }
+
+    export function isNodeModulesDirectory(dirPath: Path) {
+        return endsWith(dirPath, "/node_modules");
+    }
 }
\ No newline at end of file
diff --git a/src/compiler/resolutionCache.ts b/src/compiler/resolutionCache.ts
index 011baa788b1a2..d512087154473 100644
--- a/src/compiler/resolutionCache.ts
+++ b/src/compiler/resolutionCache.ts
@@ -428,10 +428,6 @@ namespace ts {
             return cache && cache.get(moduleName);
         }
 
-        function isNodeModulesDirectory(dirPath: Path) {
-            return endsWith(dirPath, "/node_modules");
-        }
-
         function isNodeModulesAtTypesDirectory(dirPath: Path) {
             return endsWith(dirPath, "/node_modules/@types");
         }
diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index 3412c1c1598f7..c0a9b9530abe5 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -1664,6 +1664,13 @@ namespace ts.server {
                     const jsconfigFileName = asNormalizedPath(combinePaths(searchPath, "jsconfig.json"));
                     result = action(jsconfigFileName, combinePaths(canonicalSearchPath, "jsconfig.json"));
                     if (result) return jsconfigFileName;
+
+                    // If we started within node_modules, don't look outside node_modules.
+                    // Otherwise, we might pick up a very large project and pull in the world,
+                    // causing an editor delay.
+                    if (isNodeModulesDirectory(canonicalSearchPath)) {
+                        break;
+                    }
                 }
 
                 const parentPath = asNormalizedPath(getDirectoryPath(searchPath));