diff --git a/reactfire/firebaseApp/sdk.tsx b/reactfire/firebaseApp/sdk.tsx
index 83381840..eb119b7b 100644
--- a/reactfire/firebaseApp/sdk.tsx
+++ b/reactfire/firebaseApp/sdk.tsx
@@ -1,5 +1,25 @@
 import { useFirebaseApp, preloadRequest, usePreloadedRequest } from '..';
 
+type RemoteConfig = import('firebase/app').remoteConfig.RemoteConfig;
+type Storage = import('firebase/app').storage.Storage;
+type Firestore = import('firebase/app').firestore.Firestore;
+type Performance = import('firebase/app').performance.Performance;
+type Messaging = import('firebase/app').messaging.Messaging;
+type Functions = import('firebase/app').functions.Functions;
+type Database = import('firebase/app').database.Database;
+type Auth = import('firebase/app').auth.Auth;
+
+type FirebaseSDK =
+  | (() => firebase.analytics.Analytics)
+  | (() => firebase.auth.Auth)
+  | ((url?: string) => firebase.database.Database)
+  | (() => firebase.firestore.Firestore)
+  | ((region?: string) => firebase.functions.Functions)
+  | (() => firebase.messaging.Messaging)
+  | (() => firebase.performance.Performance)
+  | (() => firebase.remoteConfig.RemoteConfig)
+  | ((url?: string) => firebase.storage.Storage);
+
 enum SDK {
   ANALYTICS = 'analytics',
   AUTH = 'auth',
@@ -12,14 +32,21 @@ enum SDK {
   STORAGE = 'storage'
 }
 
-function fetchSDK(sdk: SDK, firebaseApp: firebase.app.App) {
+function fetchSDK(
+  sdk: SDK,
+  firebaseApp: firebase.app.App,
+  settingsCallback: (sdk: FirebaseSDK) => Promise<any> | void = () =>
+    Promise.resolve()
+) {
   if (!firebaseApp) {
     throw new Error('Firebase app was not provided');
   }
 
-  let sdkPromise;
+  let sdkPromise: Promise<FirebaseSDK>;
 
   if (firebaseApp[sdk]) {
+    // Don't apply settings here. Only needed for lazy loaded SDKs.
+    // If not lazy loaded, user can provide settings as normal
     sdkPromise = Promise.resolve(firebaseApp[sdk]);
   } else {
     switch (sdk) {
@@ -67,8 +94,12 @@ function fetchSDK(sdk: SDK, firebaseApp: firebase.app.App) {
         );
         break;
     }
-    sdkPromise = sdkPromise.then(() => firebaseApp[sdk]);
+    sdkPromise = sdkPromise
+      .then(() => settingsCallback(firebaseApp[sdk]))
+      .then(() => firebaseApp[sdk]);
   }
+  preloadRequest(() => sdkPromise, `firebase-sdk-${sdk}`);
+
   return sdkPromise;
 }
 
@@ -84,8 +115,11 @@ function useSDK(sdk: SDK, firebaseApp?: firebase.app.App) {
   return usePreloadedRequest(result);
 }
 
-export function preloadAuth(firebaseApp: firebase.app.App) {
-  return fetchSDK(SDK.AUTH, firebaseApp);
+export function preloadAuth(
+  firebaseApp: firebase.app.App,
+  settingsCallback?: (auth: () => Auth) => void
+) {
+  return fetchSDK(SDK.AUTH, firebaseApp, settingsCallback);
 }
 
 export function useAuth(firebaseApp?: firebase.app.App) {
@@ -100,56 +134,77 @@ export function useAnalytics(firebaseApp?: firebase.app.App) {
   return useSDK(SDK.ANALYTICS, firebaseApp);
 }
 
-export function preloadDatabase(firebaseApp: firebase.app.App) {
-  return fetchSDK(SDK.DATABASE, firebaseApp);
+export function preloadDatabase(
+  firebaseApp: firebase.app.App,
+  settingsCallback?: (database: () => Database) => void
+) {
+  return fetchSDK(SDK.DATABASE, firebaseApp, settingsCallback);
 }
 
 export function useDatabase(firebaseApp?: firebase.app.App) {
   return useSDK(SDK.DATABASE, firebaseApp);
 }
 
-export function preloadFirestore(firebaseApp: firebase.app.App) {
-  return fetchSDK(SDK.FIRESTORE, firebaseApp);
+export function preloadFirestore(
+  firebaseApp: firebase.app.App,
+  settingsCallback?: (firestore: () => Firestore) => Promise<void>
+) {
+  return fetchSDK(SDK.FIRESTORE, firebaseApp, settingsCallback);
 }
 
 export function useFirestore(firebaseApp?: firebase.app.App) {
   return useSDK(SDK.FIRESTORE, firebaseApp);
 }
 
-export function preloadFunctions(firebaseApp: firebase.app.App) {
-  return fetchSDK(SDK.FUNCTIONS, firebaseApp);
+export function preloadFunctions(
+  firebaseApp?: firebase.app.App,
+  settingsCallback?: (functions: () => Functions) => void
+) {
+  return fetchSDK(SDK.FUNCTIONS, firebaseApp, settingsCallback);
 }
 
 export function useFunctions(firebaseApp?: firebase.app.App) {
   return useSDK(SDK.FUNCTIONS, firebaseApp);
 }
 
-export function preloadMessaging(firebaseApp: firebase.app.App) {
-  return fetchSDK(SDK.MESSAGING, firebaseApp);
+export function preloadMessaging(
+  firebaseApp: firebase.app.App,
+  settingsCallback?: (messaging: () => Messaging) => void
+) {
+  return fetchSDK(SDK.MESSAGING, firebaseApp, settingsCallback);
 }
 
 export function useMessaging(firebaseApp?: firebase.app.App) {
   return useSDK(SDK.MESSAGING, firebaseApp);
 }
 
-export function preloadPerformance(firebaseApp: firebase.app.App) {
-  return fetchSDK(SDK.PERFORMANCE, firebaseApp);
+export function preloadPerformance(
+  firebaseApp: firebase.app.App,
+  settingsCallback?: (performance: () => Performance) => void
+) {
+  return fetchSDK(SDK.PERFORMANCE, firebaseApp, settingsCallback);
 }
 
 export function usePerformance(firebaseApp?: firebase.app.App) {
   return useSDK(SDK.PERFORMANCE, firebaseApp);
 }
 
-export function preloadRemoteConfig(firebaseApp: firebase.app.App) {
-  return fetchSDK(SDK.REMOTE_CONFIG, firebaseApp);
+export function preloadRemoteConfig(
+  firebaseApp: firebase.app.App,
+  settingsCallback?: (remoteConfig: () => RemoteConfig) => Promise<any>
+) {
+  return fetchSDK(SDK.REMOTE_CONFIG, firebaseApp, settingsCallback);
 }
 
 export function useRemoteConfig(firebaseApp?: firebase.app.App) {
   return useSDK(SDK.REMOTE_CONFIG, firebaseApp);
 }
 
-export function preloadStorage(firebaseApp: firebase.app.App) {
-  return fetchSDK(SDK.STORAGE, firebaseApp);
+export function preloadStorage(
+  firebaseApp: firebase.app.App,
+  settingsCallback: (storage: () => Storage) => Promise<void>
+) {
+  return fetchSDK(SDK.STORAGE, firebaseApp, settingsCallback);
 }
 
 export function useStorage(firebaseApp?: firebase.app.App) {
diff --git a/sample/src/App.js b/sample/src/App.js
index 359d73d0..69e8a634 100644
--- a/sample/src/App.js
+++ b/sample/src/App.js
@@ -38,11 +38,21 @@ const Card = ({ title, children }) => {
 // fetching them now
 const preloadSDKs = firebaseApp => {
   return Promise.all([
-    preloadFirestore(firebaseApp),
+    preloadFirestore(firebaseApp, firestore => {
+      return firestore().enablePersistence();
+    }),
     preloadDatabase(firebaseApp),
-    preloadStorage(firebaseApp),
+    preloadStorage(firebaseApp, storage => {
+      storage().setMaxUploadRetryTime(10000);
+    }),
     preloadAuth(firebaseApp),
-    preloadRemoteConfig(firebaseApp)
+    preloadRemoteConfig(firebaseApp, remoteConfig => {
+      remoteConfig().settings = {
+        minimumFetchIntervalMillis: 10000,
+        fetchTimeoutMillis: 10000
+      };
+      return remoteConfig().fetchAndActivate();
+    })
   ]);
 };