diff --git a/src/main/app/application-controller.ts b/src/main/app/application-controller.ts
index c747592..65b8d0f 100644
--- a/src/main/app/application-controller.ts
+++ b/src/main/app/application-controller.ts
@@ -134,6 +134,8 @@ export function createApplicationController({
       mainWindow = deps.createMainWindow();
       loadingWindow = deps.createLoadingWindow();
 
+      loadingWindow.show();
+
       state = "starting";
       await startNodecg();
 
@@ -143,7 +145,6 @@ export function createApplicationController({
       }
 
       await loadingWindow.loadURL(paths.loadingDashboardUrl);
-      loadingWindow.show();
 
       const loadingShownAt = now();
 
diff --git a/src/main/nodecg/runtime-provisioner.ts b/src/main/nodecg/runtime-provisioner.ts
index 631ce38..7bacc14 100644
--- a/src/main/nodecg/runtime-provisioner.ts
+++ b/src/main/nodecg/runtime-provisioner.ts
@@ -23,11 +23,13 @@ type RuntimeProvisionerDeps = {
       recursive: true;
       force: true;
       dereference: true;
-      filter: (sourcePath: string) => boolean;
+      filter?: (sourcePath: string) => boolean;
     },
   ) => unknown;
   readFileSync: (filePath: string) => string | Buffer;
   writeFileSync: (filePath: string, content: string) => unknown;
+  statSync: (filePath: string) => { isDirectory: () => boolean };
+  symlinkSync: (target: string, path: string, type: "junction") => unknown;
 };
 
 export type PreparedNodecgRuntime = {
@@ -84,6 +86,8 @@ function resolveDeps(deps?: Partial<RuntimeProvisionerDeps>): RuntimeProvisioner
     cpSync: deps?.cpSync ?? fs.cpSync,
     readFileSync: deps?.readFileSync ?? fs.readFileSync,
     writeFileSync: deps?.writeFileSync ?? fs.writeFileSync,
+    statSync: deps?.statSync ?? fs.statSync,
+    symlinkSync: deps?.symlinkSync ?? fs.symlinkSync,
   };
 }
 
@@ -150,16 +154,20 @@ function installManagedRuntime(
     deps.rmSync(path.join(targetRuntimePath, entry), { recursive: true, force: true });
   }
 
-  deps.cpSync(sourceRuntimePath, targetRuntimePath, {
-    recursive: true,
-    force: true,
-    dereference: true,
-    filter: (sourcePath) => {
-      const relativePath = path.relative(sourceRuntimePath, sourcePath);
-      const firstSegment = relativePath.split(path.sep)[0];
-      return !WRITABLE_NODECG_DIRS.includes(firstSegment as (typeof WRITABLE_NODECG_DIRS)[number]);
-    },
-  });
+  for (const entry of MANAGED_RUNTIME_ENTRIES) {
+    const sourcePath = path.join(sourceRuntimePath, entry);
+    const targetPath = path.join(targetRuntimePath, entry);
+
+    if (!deps.existsSync(sourcePath)) {
+      continue;
+    }
+
+    if (deps.statSync(sourcePath).isDirectory()) {
+      deps.symlinkSync(sourcePath, targetPath, "junction");
+    } else {
+      deps.cpSync(sourcePath, targetPath, { recursive: true, force: true, dereference: true });
+    }
+  }
 
   const sourceRuntime = readJson(path.join(sourceRuntimePath, ".scoreko-runtime.json"), deps);
   deps.writeFileSync(
diff --git a/src/tests/application-controller.test.ts b/src/tests/application-controller.test.ts
index f2af329..9f6c5b9 100644
--- a/src/tests/application-controller.test.ts
+++ b/src/tests/application-controller.test.ts
@@ -133,10 +133,10 @@ test("ApplicationController preserves startup ordering and schedules updates aft
     "create-manager",
     "create-main",
     "create-loading",
+    "loading:show",
     "start-nodecg",
     "wait-nodecg",
     `loading:load:${paths.loadingDashboardUrl}`,
-    "loading:show",
     `main:load:${paths.mainDashboardUrl}`,
     "main:show",
     "loading:close",
@@ -192,10 +192,10 @@ test("ApplicationController directly launches packaged app after runtime install
     "create-manager",
     "create-main",
     "create-loading",
+    "loading:show",
     "start-nodecg",
     "wait-nodecg",
     "loading:load:http://localhost:9090/loading",
-    "loading:show",
     "main:load:http://localhost:9090/main",
     "main:show",
     "loading:close",
diff --git a/src/tests/runtime-provisioner.test.ts b/src/tests/runtime-provisioner.test.ts
index 59bd04f..3675d92 100644
--- a/src/tests/runtime-provisioner.test.ts
+++ b/src/tests/runtime-provisioner.test.ts
@@ -38,10 +38,21 @@ function createFakeFs(initialPaths: string[] = [], initialFiles: Record<string,
       cpSync: (from: string, to: string) => {
         state.copied.push({ from: path.normalize(from), to: path.normalize(to) });
         state.paths.add(path.normalize(to));
-        state.paths.add(path.join(path.normalize(to), "index.js"));
-        state.paths.add(path.join(path.normalize(to), "package.json"));
-        state.paths.add(path.join(path.normalize(to), "node_modules", "nodecg", "dist", "server", "bootstrap.js"));
-        state.paths.add(path.join(path.normalize(to), "bundles", "scoreko-dev", "package.json"));
+      },
+      statSync: (filePath: string) => ({
+        isDirectory: () => {
+          const normalized = path.normalize(filePath);
+          return normalized.endsWith("node_modules") || normalized.endsWith("bundles");
+        },
+      }),
+      symlinkSync: (target: string, linkPath: string, type: string) => {
+        state.copied.push({ from: path.normalize(target), to: path.normalize(linkPath) });
+        state.paths.add(path.normalize(linkPath));
+        if (target.endsWith("node_modules")) {
+          state.paths.add(path.join(path.normalize(linkPath), "nodecg", "dist", "server", "bootstrap.js"));
+        } else if (target.endsWith("bundles")) {
+          state.paths.add(path.join(path.normalize(linkPath), "scoreko-dev", "package.json"));
+        }
       },
       readFileSync: (filePath: string) => state.files.get(path.normalize(filePath)) ?? "{}",
       writeFileSync: (filePath: string, content: string) => {
@@ -57,7 +68,9 @@ function getSourcePaths(source: string) {
     source,
     path.join(source, "index.js"),
     path.join(source, "package.json"),
+    path.join(source, "node_modules"),
     path.join(source, "node_modules", "nodecg", "dist", "server", "bootstrap.js"),
+    path.join(source, "bundles"),
     path.join(source, "bundles", "scoreko-dev", "package.json"),
     path.join(source, ".scoreko-runtime.json"),
   ];
@@ -81,7 +94,7 @@ test("prepareUserNodecgRuntime copies the packaged runtime into userData", () =>
 
   assert.equal(preparedRuntime.runtimePath, path.join(userData, "nodecg"));
   assert.equal(preparedRuntime.installed, true);
-  assert.equal(state.copied.length, 1);
+  assert.equal(state.copied.length, 4);
   assert.ok(state.paths.has(path.join(userData, "nodecg", "cfg")));
   assert.ok(state.paths.has(path.join(userData, "nodecg", "db")));
   assert.ok(state.paths.has(path.join(userData, "nodecg", "logs")));
@@ -150,7 +163,7 @@ test("prepareUserNodecgRuntime refreshes managed files when the app version chan
   });
 
   assert.equal(preparedRuntime.installed, true);
-  assert.equal(state.copied.length, 1);
+  assert.equal(state.copied.length, 4);
   assert.ok(state.removed.includes(path.join(target, "node_modules")));
   assert.ok(state.removed.includes(path.join(target, "bundles")));
   assert.ok(!state.removed.includes(path.join(target, "db")));
@@ -190,7 +203,7 @@ test("prepareUserNodecgRuntime refreshes managed files when the source runtime w
   });
 
   assert.equal(preparedRuntime.installed, true);
-  assert.equal(state.copied.length, 1);
+  assert.equal(state.copied.length, 4);
   assert.ok(state.removed.includes(path.join(target, "bundles")));
   assert.ok(!state.removed.includes(path.join(target, "cfg")));
 });