diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index 06067b02..00583224 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -97,15 +97,27 @@ Chain.prototype._init = function _init() {
 
   utils.nextTick(function() {
     var count = self.db.count();
-    var i, entry;
+    var entry;
+    var i = 1;
 
-    for (i = 1; i < count; i++)
-      self._saveEntry(self.db.get(i));
+    function done() {
+      self.loading = false;
+      self.emit('load');
 
-    self.loading = false;
-    self.emit('load');
+      utils.debug('Chain successfully loaded.');
+    }
 
-    utils.debug('Chain successfully loaded.');
+    (function next() {
+      if (i >= count)
+        return done();
+      self.db.getAsync(i, function(err, entry) {
+        if (err)
+          throw err;
+        self._saveEntry(entry);
+        i += 1;
+        next();
+      });
+    })();
   });
 };
 
@@ -996,7 +1008,7 @@ ChainDB.prototype._read = function _read(size, offset) {
   }
 };
 
-ChainDB.prototype._readAsync = function _read(size, offset) {
+ChainDB.prototype._readAsync = function _read(size, offset, callback) {
   var self = this;
   var data = new Buffer(size);
   var index = 0;
diff --git a/lib/bcoin/pool.js b/lib/bcoin/pool.js
index 5bd0eefa..3a267197 100644
--- a/lib/bcoin/pool.js
+++ b/lib/bcoin/pool.js
@@ -414,6 +414,9 @@ Pool.prototype._addLoader = function _addLoader() {
 };
 
 Pool.prototype.startSync = function startSync() {
+  if (this.loading)
+    return this.once('load', this.startSync.bind(this));
+
   this.syncing = true;
 
   this._startInterval();
@@ -436,6 +439,9 @@ Pool.prototype.stopSync = function stopSync() {
 
   this.syncing = false;
 
+  if (this.loading)
+    return;
+
   this._stopInterval();
   this._stopTimer();
 };
@@ -1052,6 +1058,9 @@ Pool.prototype.addWallet = function addWallet(w, defaultTs) {
   var self = this;
   var e;
 
+  if (this.loading)
+    return this.once('load', this.addWallet.bind(this, w, defaultTs));
+
   if (this.wallets.indexOf(w) !== -1)
     return false;
 
@@ -1089,6 +1098,7 @@ Pool.prototype.addWallet = function addWallet(w, defaultTs) {
 
 Pool.prototype.removeWallet = function removeWallet(w) {
   var i = this.wallets.indexOf(w);
+  assert(!this.loading);
   if (i == -1)
     return;
   this.wallets.splice(i, 1);
@@ -1127,6 +1137,8 @@ Pool.prototype.searchWallet = function(w) {
   var self = this;
   var ts;
 
+  assert(!this.loading);
+
   if (this.options.fullNode)
     return;
 
@@ -1167,6 +1179,8 @@ Pool.prototype.search = function search(id, range, e) {
   var self = this;
   var hashes, pending, listener, timeout, done, total, cb;
 
+  assert(!this.loading);
+
   if (this.options.fullNode)
     return;