diff --git a/lib/bcoin/worker.js b/lib/bcoin/worker.js
index fd22b766..81f42334 100644
--- a/lib/bcoin/worker.js
+++ b/lib/bcoin/worker.js
@@ -15,10 +15,14 @@ if (typeof importScripts !== 'undefined') {
     penv = JSON.parse(event.data);
 
     env = self.bcoin.env(penv.BCOIN_WORKER_NETWORK);
-    env.workers.listen(+penv.BCOIN_WORKER_ID);
+    env.workers.listen(+penv.BCOIN_WORKER_ID, {
+      debug: +penv.BCOIN_WORKER_DEBUG === 1
+    });
   };
 } else {
   penv = process.env;
   env = require('./env')(penv.BCOIN_WORKER_NETWORK);
-  env.workers.listen(+penv.BCOIN_WORKER_ID);
+  env.workers.listen(+penv.BCOIN_WORKER_ID, {
+    debug: +penv.BCOIN_WORKER_DEBUG === 1
+  });
 }
diff --git a/lib/bcoin/workers.js b/lib/bcoin/workers.js
index 245a3d7c..2bae6978 100644
--- a/lib/bcoin/workers.js
+++ b/lib/bcoin/workers.js
@@ -215,7 +215,7 @@ Workers.prototype.mine = function mine(attempt, callback) {
 
 function Worker(id) {
   var self = this;
-  var cp;
+  var penv, cp;
 
   if (!(this instanceof Worker))
     return new Worker(id);
@@ -227,6 +227,12 @@ function Worker(id) {
   this.parser = new Parser();
   this.setMaxListeners(utils.MAX_SAFE_INTEGER);
 
+  penv = {
+    BCOIN_WORKER_ID: id + '',
+    BCOIN_WORKER_NETWORK: network.type,
+    BCOIN_WORKER_DEBUG: (bcoin.debugLogs || bcoin.debugFile) ? '1' : '0'
+  };
+
   if (bcoin.isBrowser) {
     this.child = new global.Worker('/bcoin-worker.js');
 
@@ -246,19 +252,13 @@ function Worker(id) {
       self.emit('data', data);
     };
 
-    this.child.postMessage(JSON.stringify({
-      BCOIN_WORKER_ID: id + '',
-      BCOIN_WORKER_NETWORK: network.type
-    }));
+    this.child.postMessage(JSON.stringify(penv));
   } else {
     cp = require('child_' + 'process');
 
     this.child = cp.spawn(process.argv[0], [__dirname + '/worker.js'], {
       stdio: 'pipe',
-      env: utils.merge({}, process.env, {
-        BCOIN_WORKER_ID: id + '',
-        BCOIN_WORKER_NETWORK: network.type
-      })
+      env: utils.merge({}, process.env, penv)
     });
 
     this.child.on('error', function(err) {
@@ -279,7 +279,7 @@ function Worker(id) {
 
     this.child.stderr.setEncoding('utf8');
     this.child.stderr.on('data', function(data) {
-      bcoin.debug(data);
+      bcoin.debug(data.trim());
     });
   }
 
@@ -403,10 +403,11 @@ utils.inherits(Worker, EventEmitter);
  * @exports Master
  * @constructor
  * @param {Number} id - Worker ID.
+ * @param {Object?} options
  * @property {Number} id
  */
 
-function Master(id) {
+function Master(id, options) {
   var self = this;
 
   if (!(this instanceof Master))
@@ -417,6 +418,7 @@ function Master(id) {
   this.id = id;
   this.framer = new Framer();
   this.parser = new Parser();
+  this.options = options || {};
 
   if (bcoin.isBrowser) {
     global.onerror = function onerror(err) {
@@ -503,10 +505,25 @@ Master.prototype.sendEvent = function sendEvent() {
  */
 
 Master.prototype.log = function log() {
-  if (bcoin.isBrowser)
-    return console.error.apply(console.error, arguments);
-  process.stderr.write('Worker ' + this.id + ': ');
-  return console.error.apply(console.error, arguments);
+  var args, msg;
+
+  if (!this.options.debug)
+    return;
+
+  args = Array.prototype.slice.call(arguments);
+
+  msg = typeof args[0] !== 'object'
+    ? utils.format(args, false)
+    : args[0];
+
+  msg = utils.format(['Worker %d: %s', this.id, msg], false);
+
+  if (bcoin.isBrowser) {
+    console.error(msg);
+    return;
+  }
+
+  process.stderr.write(msg + '\n');
 };
 
 /**
@@ -522,11 +539,12 @@ Master.prototype.destroy = function destroy() {
 /**
  * Listen for messages from master process (only if worker).
  * @param {Number} id - Worker id.
+ * @param {Object?} options
  * @returns {Master}
  */
 
-Master.listen = function listen(id) {
-  var master = new Master(id);
+Master.listen = function listen(id, options) {
+  var master = new Master(id, options);
   var log = master.log.bind(master);
 
   bcoin.debug = log;
diff --git a/test/chain-test.js b/test/chain-test.js
index 8bb13922..cd286b51 100644
--- a/test/chain-test.js
+++ b/test/chain-test.js
@@ -11,6 +11,8 @@ describe('Chain', function() {
   var chain, wallet, miner;
   var competingTip, oldTip, ch1, ch2, cb1, cb2;
 
+  this.timeout(5000);
+
   chain = new bcoin.chain({ name: 'chain-test', db: 'memory' });
   wallet = new bcoin.wallet();
   miner = new bcoin.miner({
diff --git a/test/mempool-test.js b/test/mempool-test.js
index 43232c64..bdc9529e 100644
--- a/test/mempool-test.js
+++ b/test/mempool-test.js
@@ -6,6 +6,8 @@ var assert = require('assert');
 var opcodes = constants.opcodes;
 
 describe('Mempool', function() {
+  this.timeout(5000);
+
   var chain = new bcoin.chain({
     name: 'mp-chain',
     db: 'memory'