diff --git a/server/config/index.js b/server/config/index.js
index 4c45558..827006d 100644
--- a/server/config/index.js
+++ b/server/config/index.js
@@ -4,7 +4,7 @@ const config = {
   bcoin_http: 'localhost',
   bcoin: {
     network: 'main',
-    db: 'leveldb',
+    db: 'mem',
     prefix: '.',
     checkpoints: true,
     workers: false,
diff --git a/server/lib/api/address.js b/server/lib/api/address.js
index 6359400..722adb2 100644
--- a/server/lib/api/address.js
+++ b/server/lib/api/address.js
@@ -8,6 +8,8 @@ const TTL = config.api.request_ttl;
 module.exports = function AddressAPI(router) {
   router.get('/addr/:addr', (req, res) => {
     const addr = req.params.addr || '';
+    logger.log('debug',
+      'Warning: Requesting data from Bcoin by address, may take some time');
     // Get Bcoin data
     return request(`${API_URL}/tx/address/${addr}`,
       { timeout: TTL },
diff --git a/server/lib/api/transaction.js b/server/lib/api/transaction.js
index 6948402..d07a398 100644
--- a/server/lib/api/transaction.js
+++ b/server/lib/api/transaction.js
@@ -147,7 +147,7 @@ module.exports = function transactionAPI(router) {
           const addr = req.query.address || '';
 
           logger.log('debug',
-            'Warning: Requesting data from Bcoin, may take some time');
+            'Warning: Requesting data from Bcoin by address, may take some time');
 
           return request(`${API_URL}/tx/address/${addr}`,
             { timeout: TTL },
diff --git a/server/models/input.js b/server/models/input.js
index 9f2c067..a6ebc1b 100644
--- a/server/models/input.js
+++ b/server/models/input.js
@@ -10,6 +10,8 @@ const InputSchema = new Schema({
   address:  { type: String, default: '' },
 });
 
+InputSchema.index({ address: 1 });
+
 const Input = mongoose.model('Input', InputSchema);
 
 module.exports = Input;
diff --git a/server/models/output.js b/server/models/output.js
index 65f2194..56694eb 100644
--- a/server/models/output.js
+++ b/server/models/output.js
@@ -9,6 +9,8 @@ const OutputSchema = new Schema({
   type:    { type: String, default: '' },
 });
 
+OutputSchema.index({ address: 1 });
+
 const Output = mongoose.model('Output', OutputSchema);
 
 module.exports = Output;
diff --git a/server/models/transaction.js b/server/models/transaction.js
index 0c5974b..8d30aba 100644
--- a/server/models/transaction.js
+++ b/server/models/transaction.js
@@ -22,6 +22,8 @@ const TransactionSchema = new Schema({
   network:     { type: String, default: '' },
 });
 
+TransactionSchema.index({ hash: 1 });
+
 const Transaction = mongoose.model('Transaction', TransactionSchema);
 
 module.exports = Transaction;