7 Performance Testing Tools to Stress Test Your Website

Even perhaps most likely essentially the most novice amongst web site on-line house owners has in the end or completely completely different examined their web site on-line effectivity. However, most of those assessments usually take into consideration loading velocity or shopper expertise indices.

But what about load testing?

Although most web websites are inclined to web site friends ranges which may very well be often fairly frequent, there may be additionally events when some internet sites may have to tackle heavy an entire bunch. Examples of those embody on-line shops, and even some authorities web websites.

If your web site on-line will get an sudden spike contained in the variety of associates over a fast interval, how correctly are you outfitted to maintain it?

Understanding Load Testing

What is load testing?

Load testing is bench-marking an net web site to see the best way by which it performs beneath completely different an entire bunch.

For event, a confirm could simulate an rising variety of concurrent associates touchdown in your site. It may even file how your site handles them and information them in your reference.

Example of load tests
Example – load assessments at LoadStorm: Metrics measured embody frequent response time, peak response time, and error price (image source).

What sorts of “load” are examined?

Depending on the software program program you select to load confirm your site with, every could embody absolutely completely completely different decisions. The easiest will merely embrace simulating an ever rising load and halting when your site crashes.

Other units can be able to producing a simulated load that mimics absolutely completely completely different shopper behaviour, comparable to performing queries, altering pages, or loading completely completely different capabilities. Some could even have the selection to map out logical flows for every express explicit particular person state of affairs.

Load Testing Tools to Consider

Depending on their complexity, some load testing units may probably be fairly dear. However, there are cheaper selections in the marketplace and a few are even free to be used. I’ve included a mix of those beneath in your reference, together with a few open present selections.

1. Loadview by Dotcom Monitor


Website: https://www.loadview-testing.com/

Price: From $199/mo, free trial accessible

Loadview is among the many many additional full decisions accessible in the marketplace and correct this second depends upon a cloud service mannequin. This signifies that regardless of type of simulation you want from them, you solely pay for the service – there is also zero funding in {{{hardware}}} or the rest.

Feature good, Loadview presents a extraordinarily superior reply that can embody one factor from straight up HTTP load tests to an aesthetic mixture of your alternative. It is prepared to simulate dynamic variables and even geo-location choice in its assessments.


  • Post-firewall assessments
  • Handles dynamic variables
  • Detailed waterfall charts
  • Load confirm curves

2. K6 Cloud (beforehand Load Impact)


Website: https://k6.io/

Price: From $59/mo

K6 is a cloud-based, open present load testing software program program that’s provided as a service. One of the issues that makes this software program program fascinating is that it’s priced on a variable-use mannequin which signifies that the value of entry may probably be comparatively low relying in your wants. It is, nonetheless, primarily developer-centric.

Aside from load testing, K6 furthermore presents effectivity monitoring. Its load testing aspect is focusing on excessive an entire bunch and can maintain completely different modes comparable to spikes, stress testing, and endurance runs.

*K6 wouldn’t run in browsers nor does it run in NodeJS


  • Developer-friendly APIs.
  • Scripting in JavaScript
  • Performance monitoring

3. Load Ninja


Website: https://loadninja.com/

Price: From $119.92/mo

Load Ninja permits you to load-test with exact browsers primarily based completely on recorded scripts after which helps analyze effectivity outcomes. Its use of exact browsers at scale signifies that this software program program helps recreate an additional life like setting and finish end end result for testing.

Results may probably be analyzed in real-time and thanks to the useful units the system offers, your scripting time may probably be diminished by as heaps as 60%. Internal features may probably be examined as correctly, each with proxy-based mounted IPs or your explicit particular person fluctuate of dynamic IPs (by the use of the utilization of a whitelister).


  • Test with an entire bunch of exact browsers
  • Diagnose assessments in real-time
  • Insights on inner software program program effectivity

4. LoadRunner by Micro Focus


Website: https://www.microfocus.com/

Price: From $0

With an entry-level free neighborhood account that helps assessments from 50 digital purchasers, LoadRunner is obtainable even to the most recent web site on-line house owners. However, when you scale it up to excessive ranges the associated worth rises exponentially.

This Cloud-based service furthermore presents the utilization of an Integrated Development Environment for unit assessments. It helps numerous software program program environments together with Web, Mobile, WebSockets, Citrix, Java, .NET, and far more. Be acutely conscious that LoadRUnner may probably be fairly superior and has a steep discovering out curve.


  • Patented auto-correlation engine
  • Supports 50+ utilized sciences and software program program environments
  • Reproduces exact enterprise processes with scripts

5. Loader


Website: https://loader.io/

Price: From $0

Compared to what we’ve confirmed to this stage, Loader is a heaps simpler and extra main software program program. Its free plan helps load testing with up to 10,000 digital purchasers which is sufficient for lots of frequent web site friends web websites. 

Unfortunately you’ve got to to have a paid plan to entry additional superior decisions comparable to  superior analytics, concurrent assessments, and precedence help. It is straightforward to use although since principally you merely add your site, specify the parameters, then let the confirm run.


  • Shareable graphs & stats
  • Useable in a GUI or API format
  • Supports DNS Verification and precedence loaders

6. Gatling

Gatling homepage

Website: https://gatling.io/

Price: From $0

Gatling is accessible in two flavors, Open Source or Enterprise. The former permits you to load-test as an integration alongside along with your explicit particular person progress pipeline. It consists of each an net recorder and report generator with the plan. The Enterprise model has on-premise deployments or alternatively, you will have the choice to go for a Cloud model primarily based completely on Amazon Web Services (AWS)

Although each of those variations are feature-packed, the Enterprise model helps just a few extras that don’t embody Open Source. For event, it has an additional usable administration interface and helps a wider fluctuate of integrations.


  • Multi-protocol scripting
  • Unlimited testing and throughput
  • Gatling scripting DSL

7. The Grinder

Grinder load testing tool

Website: https://sourceforge.net/projects/grinder/

Price: From $0

Grinder is open sourced all the best way by which via which and may very well be the one actually free probability on this doc. However, it has to be run domestically in your explicit particular person progress setting and wishes just a few additional comparable to Java so as to work. 

However, being open present it has been adopted extensively and builders have give you a plentiful variety of plugins which vastly lengthen it by means of each use-ability and effectivity. Still, until you’re a developer or so oriented, The Grinder might be going to be just a bit little little bit of a handful for you to use.


  • Flexible scripting primarily based completely on Jython and Clojure
  • Highly modular with tons of plugins
  • Distributed framework and mature HTTP help

When to Load Test Your Website Performance?

If you’ve had a try numerous the units accessible, you might nearly actually have seen that numerous them current every trial accounts or some form of restricted free model. This makes them obtainable to be used for a giant viewers.

Most web site on-line house owners want to be involved about hosting performance because of it impacts additional of simply user experience. For many enterprise house owners, the provision of your web site on-line typically is a matter of title standing.

Sites which may be rising want to be notably cautious of availability and scalability of the sources used to net web internet hosting your web site on-line. In most conditions a excessive share of shopper response time is spent on the bottom of your site. However, as internet sites develop in web site friends quantity this may increasingly change.

More web site friends often means a disproportionate progress in backend processing and your system will battle as that spikes. Much will rely on variables distinctive to your site progress, so it isn’t doable to provide you with a safe variety of associates at which diploma it’s going to occur.

To realistically see how your site effectivity you want load testing to be carried out. Exactly when to do it’s debatable, nonetheless my recommendation may probably be to plan forward and confirm early. 

What to Check for When Load Testing?

As the very decide implies, your core perform have to be the fundamental of how your site performs beneath an entire bunch. This will allow you to observe quite a few factors comparable to:

  1. At what diploma your site effectivity begins to degrade
  2. What truly occurs when service degrades

When I discussed how absolutely completely completely different internet sites could react in a single different method primarily based completely on their development, that was a sign meant for you to perceive that not all internet sites fail throughout the equal approach as correctly. Some database-intensive internet sites might fail on that point, whereas others could endure IO failures primarily based completely on server connection an entire bunch.

Because of this, you want to be ready to arrange quite a lot of assessments to perceive how your site and server will cope beneath completely different situations. Based on these, protect an in depth eye on just a few key metrics comparable to your server response time, the variety of errors cropping up, and what areas these faults could lie in.

Generating superior scripts and runs together with the accompanying logic may probably be troublesome. I counsel that you just merely approach load testing incrementally. Start with a brute pressure confirm which will merely confirm your site beneath a repeatedly rising stream of web site friends.

As you get hold of expertise, add on completely completely different components comparable to variable behaviour, rising your scripts and logic over time.

Conclusion: Some is Better than None

When it comes to load testing, beginning with the fundamentals is biggest than not getting began in the least. If you’re a newbie to all of this, do strive to do your testing on an alternate mirror or offline the place doable – keep away from load testing a dwell site once you probably can!

If you’re merely beginning out now, ensure that to create a file of your assessments. Performance testing is a journey that ought to accompany the event of your site because of it grows. The course of may probably be tiring nonetheless take into account, not having a file could make future assessments far more troublesome for you.

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