diff --git a/lib/queue.js b/lib/queue.js
index 4a5089c..53b09c4 100644
--- a/lib/queue.js
+++ b/lib/queue.js
@@ -75,39 +75,46 @@ FetchQueue.prototype.exists = function(protocol,domain,port,path,callback) {
 
 	if (!!this.scanIndex[url]) {
 		callback(null,1);
+		return 1;
 	} else {
 		this.scanIndex[url] = true;
 		callback(null,0);
+		return 1;
 	}
 };
 
 // Get last item in queue...
 FetchQueue.prototype.last = function(callback) {
 	callback = callback && callback instanceof Function ? callback : function(){};
-	var self = this;
-
-	callback(null,self[self.length-1]);
+	var item, self = this;
+	item = self[self.length-1];
+	callback(null, item);
+	return item;
 };
 
 // Get item from queue
 FetchQueue.prototype.get = function(id, callback) {
 	callback = callback && callback instanceof Function ? callback : function(){};
-	var self = this;
+	var item, self = this;
 
 	if (!isNaN(id) && self.length > id) {
-		return callback(null,self[id]);
+		item = self[id];
+		callback(null, item);
+		return item;
 	}
 };
 
 // Get first unfetched item in the queue (and return its index)
 FetchQueue.prototype.oldestUnfetchedItem = function(callback) {
 	callback = callback && callback instanceof Function ? callback : function(){};
-	var self = this;
+	var item, self = this;
 
 	for (var itemIndex = self.oldestUnfetchedIndex; itemIndex < self.length; itemIndex ++) {
 		if (self[itemIndex].status === "queued") {
 			self.oldestUnfetchedIndex = itemIndex;
-			return callback(null,self[itemIndex]);
+			item = self[itemIndex];
+			callback(null, item);
+			return item;
 		}
 	}
 
@@ -131,12 +138,13 @@ FetchQueue.prototype.max = function(statisticName,callback) {
 	});
 
 	callback(null,maxStatisticValue);
+	return maxStatisticValue;
 };
 
 // Gets the minimum total request time, request latency, or download time
 FetchQueue.prototype.min = function(statisticName,callback) {
 	callback = callback && callback instanceof Function ? callback : function(){};
-	var minStatisticValue = Infinity, self = this;
+	var minimum, minStatisticValue = Infinity, self = this;
 
 	if (allowedStatistics.join().indexOf(statisticName) === -1) {
 		// Not a recognised statistic!
@@ -148,14 +156,15 @@ FetchQueue.prototype.min = function(statisticName,callback) {
 			minStatisticValue = item.stateData[statisticName];
 		}
 	});
-
-	callback(null,minStatisticValue === Infinity? 0 : minStatisticValue);
+  minimum = minStatisticValue === Infinity? 0 : minStatisticValue;
+	callback(null, minimum);
+	return minimum;
 };
 
 // Gets the minimum total request time, request latency, or download time
 FetchQueue.prototype.avg = function(statisticName,callback) {
 	callback = callback && callback instanceof Function ? callback : function(){};
-	var NumberSum = 0, NumberCount = 0, self = this;
+	var average, NumberSum = 0, NumberCount = 0, self = this;
 
 	if (allowedStatistics.join().indexOf(statisticName) === -1) {
 		// Not a recognised statistic!
@@ -168,8 +177,9 @@ FetchQueue.prototype.avg = function(statisticName,callback) {
 			NumberCount ++;
 		}
 	});
-
-	callback(null,NumberSum / NumberCount);
+	average = NumberSum / NumberCount;
+	callback(null, average);
+	return average;
 };
 
 // Gets the number of requests which have been completed.
@@ -199,6 +209,7 @@ FetchQueue.prototype.countWithStatus = function(status,callback) {
 	});
 
 	callback(null,queueItemsMatched);
+	return queueItemsMatched;
 };
 
 // Gets the number of queue items with the given status
@@ -214,18 +225,19 @@ FetchQueue.prototype.getWithStatus = function(status,callback) {
 	});
 
 	callback(null,subqueue);
+	return subqueue;
 };
 
 // Gets the number of requests which have failed for some reason
 FetchQueue.prototype.errors = function(callback) {
 	callback = callback && callback instanceof Function ? callback : function(){};
-	var self = this;
+	var total, failedCount, notFoundCount, self = this;
 
-	self.countWithStatus("failed",function(err1,failed) {
-		self.countWithStatus("notfound",function(err2,notfound) {
-			callback(null,failed + notfound);
-		});
-	});
+	failedCount = self.countWithStatus("failed");
+	notFoundCount = self.countWithStatus("notfound");
+	total = failedCount + notFoundCount;
+	callback(null, total);
+	return total;
 };
 
 // Writes the queue to disk
diff --git a/test/cookies.js b/test/cookies.js
index 2a32d61..220786a 100644
--- a/test/cookies.js
+++ b/test/cookies.js
@@ -9,7 +9,7 @@ var cookies = [
 	"Set-Cookie: RMID=007f010019155170d6ca005f; Expires=Sat, 19 Apr 2014 05:31:54 GMT; Path=/; Domain=.nytimes.com;",
 	"Set-cookie: adxcs=-; path=/; domain=.nytimes.com",
 	"Set-Cookie: PREF=ID=8c63f2522e22574d:FF=0:TM=1366349569:LM=1366349569:S=p1Urbmfwfs-R573P; expires=Sun, 19-Apr-2015 05:32:49 GMT; path=/; domain=.google.com",
-	"Set-Cookie: NID=67=DhLO04YPAMlhETrTIe2oFPqWZfypQXLZfCIPItOvf70zhtUEMEItYfdVh6aROEzRHqtd9jHT6HJ7Oo93eqP3cjYNp8GgShfa6r0WVbsmQQRUvutbjBOPwzo7ybwYcWdB; expires=Sat, 19-Oct-2013 05:32:49 GMT; path=/; domain=.google.com; HttpOnly",
+	"Set-Cookie: NID=67=DhLO04YPAMlhETrTIe2oFPqWZfypQXLZfCIPItOvf70zhtUEMEItYfdVh6aROEzRHqtd9jHT6HJ7Oo93eqP3cjYNp8GgShfa6r0WVbsmQQRUvutbjBOPwzo7ybwYcWdB; expires=Sat, 19-Oct-2015 05:32:49 GMT; path=/; domain=.google.com; HttpOnly",
 	"Set-Cookie: fpc=d=Yq1z8hbA9WextmPFlb7suMTfMRgtSc2FyzAB7now1ExfUZ.eW7s4QSwSKlB6ZB0juN8OLZxWf_XXEIcspYaQmVVD0mD0xJ.xpXBCSw5Dl_Ql6n.RLoM.7CnTbNSsiSr2fkNiCN47tRUB4j8iWevNwQdFDn1hB8z8t1xwWt76n.sLIRY9p2_jTBhukfSD4SBpBkJhI1o-&v=2; expires=Sat, 19-Apr-2014 05:48:42 GMT; path=/; domain=www.yahoo.com",
 	"Set-Cookie: test=test; path=/test; domain=test.com"
 ];
diff --git a/test/jshint.js b/test/jshint.js
index 4ade490..b6a8bef 100644
--- a/test/jshint.js
+++ b/test/jshint.js
@@ -25,6 +25,9 @@ describe("Core code",function() {
 
 		it("module `" + item + "` should pass JSHint with no errors",function() {
 
+			var slowThresholdMilliseconds = 200;
+			this.slow(slowThresholdMilliseconds);
+
 			JSHINT(code,{
 					"indent": 4,
 					"undef": true
diff --git a/test/reliability.js b/test/reliability.js
index 6d50366..bcf2969 100644
--- a/test/reliability.js
+++ b/test/reliability.js
@@ -12,6 +12,8 @@ describe("Crawler reliability",function() {
 
 	it("should be able to handle a timeout",function(done) {
 
+		this.slow('1s')
+
 		var localCrawler = Crawler.crawl("http://127.0.0.1:3000/timeout");
 			localCrawler.timeout = 200;
 
diff --git a/test/testcrawl.js b/test/testcrawl.js
index 3ce3305..928fc8b 100644
--- a/test/testcrawl.js
+++ b/test/testcrawl.js
@@ -46,6 +46,8 @@ describe("Test Crawl",function() {
 
 	it("should support async event listeners for manual discovery",function(done) {
 
+		this.slow('1s')
+
 		// Use a different crawler this time
 		asyncCrawler.discoverResources = false;
 		asyncCrawler.queueURL("http://127.0.0.1:3000/async-stage1");