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Compare the two results paying attention to the filmstrip. Below we can see the difference between filmstrips both with and without third-party resources blocked.
It can be useful to try this out for individual third-party origins to determine which ones have the biggest impact on your page-load performance:.
This allows you to simulate a timeout or complete failure to load a resource. This can make it useful for testing network resilience of third-party content to determine how well your pages hold up when services are under heavy load or temporarily unavailable.
When scripts in third-party iframes take a long time to run, they can block the main thread delaying other tasks from running. These long tasks can cause a negative user experience leading to sluggish event handlers or dropped frames.
As these entries contain an attribution property, we can track down which frame context was responsible for the task. Below is an example that will log longtask entries to the console, including one for an "expensive" iframe:.
With async, the browser downloads the script asynchronously while it continues to parse the HTML document. When the script finishes downloading, parsing is blocked while the script executes.
With defer, the browser downloads the script asynchronously while it continues to parse the HTML document. The script doesn't run until the parsing is complete.
In general, you should always use async or defer for third party scripts unless the script does something necessary for the critical rendering path :.
Use async if it's important to have the script run earlier in the loading process. This might include some analytics scripts, for example.
Use defer for less critical resources. A video player that's below-the-fold, for example. Should you ever load third-party scripts without async or defer?
You could make a case for this if the script is a crucial part of your site functionality. For example, if you're loading your main UI library or framework from a CDN, it will be badged as "third-party script" in DevTools, but should be treated as an essential part of your site, not an add-on.
Note that not all scripts work if loaded asynchronously. Check the docs for any third-party scripts you're using. If you're using a script that can't be loaded asynchronously, you might want to consider an alternative, or eliminating the script if possible.
Some third parties may highly recommend to load their scripts sync to get ahead of other scripts , even if they would work fine async so do due diligence when evaluating strategies for loading third-party scripts.
Establishing connections to third-party origins can take a significant amount of time - particularly on slow networks.
Many steps can add up to delays including DNS lookups, redirects, and potentially several round trips to each third-party server to handle the request.
When the request for them is finally made, time can be saved as the DNS lookup has already been carried out. These other steps can be very slow as they involve looking at SSL certificates for verification, so consider Resource Hints seriously if you find third-party setup time to be an issue.
There are cases where third-party scripts can be loaded directly into an iframe. Note that this approach will still block the onload event so try not to attach critical functionality to onload.
Self-hosting may be a viable consideration if a script is considered critical. Scripts can go out of date. This can be a large issue as it prevents you from getting important security fixes without manually updating.
An alternative to self-hosting scripts would be using Service Workers to cache them. This can give you greater control over how often they are re-fetched from the network.
This could also be used to create a loading strategy where requests for non-essential third parties are throttled until the page reaches a key user moment.
This is done by enabling both variants A and B for different samples of your website traffic. The page that provides a better conversion rate wins.
This improves the loading experience for the majority of users while still making split-testing possible. Embedded third-party resources such as ads or videos can be a big contributor to slow page speed when constructed poorly.
Lazy-loading can be used to only load embedded resources when necessary. For example, serving an ad in the footer only when a user scrolls down the page.
Another pattern is lazy-loading content after the main page content loads but before a user might otherwise interact with the page.
DoubleClick have guidance on how to lazy-load ads in their official documentation. If used properly, lazy loading can increase the overall viewability percentage of an ad.
Historically, solutions for detecting if an element is visible in the viewport in order to lazy-load its content have been error-prone, often causing the browser to become sluggish.
This works, but is not efficient. IntersectionObserver is a browser API that allows us to efficiently detect when an observed element enters or exits the browser's viewport.
Learn more about how to use it for lazy-loading resources. LazySizes also has optional support for IntersectionObserver.
Analytics scripts should never slow down your page load experience, but if you defer the load too long you can miss valuable analytics data. Fortunately, there are some well-known patterns for initializing analytics lazily while retaining early page-load data.
Third-party scripts sometimes use document. Thankfully, many third-parties offer an option to asynchronously load themselves, which allows third-party scripts to load without blocking the display of the rest of the content on the page.
The fix for document. As of Chrome 53, Chrome DevTools will log warnings to the console for problematic use of document. To discover the use of document.
Lighthouse can also highlight any third-party scripts still using document. A "tag" is a snippet of code that allows digital marketing teams to collect data, set cookies or integrate third-party content like social media widgets into a site.
Managing these tags can become a real mess over time as marketing teams wish to add more ways to understand users and engineering tries to minimize the impact tags can have on user experience.
To keep experiences fast, we recommend using a Tag manager. Tag managers:. They also allow tags a way to collect values in a single unique place.
If multiple third parties wish to trigger conversion-tracking data, they can do this by pulling from the Data Layer. When using a tag manager, great care needs to be taken to avoid slowing down how quickly pages load.
This can be minimized by only allowing one user to publish versions. Anyone can configure too many tag manager auto-event listeners. With our performance guidance encouraging that you respond to events within 50ms , every tag manager event listener added eats away at that goal.
There is also no guarantee that code loaded from a third-party will remain the same as what you saw during testing. New features can be pushed out by third parties at any time, potentially breaking your page.
Self-testing, sub-resource integrity and securely transmitting third-party code to reduce the risk of in-transit modifications can help here.
Adding third-party scripts to a page implies a level of trust in the origin. There are some strategies you can take to minimize their impact on performance and security:.
HTTPS is a must. Consider the sandbox attribute on iframes. From a security perspective, this allows you to restrict the actions available from the iframe.
Below is an example of how this can be used in practice:. Good things you can do:. Become familiar with some of the most effective third-party script optimization methods like only loading tags that support the async loading pattern.
Understand how to identify and fix issues with third-party script loading. This can help you take back control of your page load performance.
Third-party script optimization should be followed by on-going real-time performance monitoring of your scripts and communication with your third-party providers.
Third-party CSS isn't safe. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.
Each of the 5 Lean management principles has its specific action items, find out how to start implementing it by following our concise guide.
Lean has proven to be an effective model for managing teams in some of the most demanding industries like software development, manufacturing, construction and many others.
A huge role in this has the fact that the methodology is simple to understand and quick to make an impact when implemented properly.
Like everything else in life, the first steps in Lean management are the most difficult, and a huge portion of the teams that fail to implement it successfully give up early on.
Although Lean management is based on the 5 principles of Lean , before applying them, you need to prepare your team, department, and even the whole organization for the change.
First of all, you need to know what your end goal is and communicate that with everybody on your team. What are you trying to achieve by implementing the Lean process within your company?
Is it optimization of your workflow so you can have faster product deliveries? Are you trying to increase your overall business profitability as a result of it?
Whatever that goal is, it needs to be clearly defined. This way, you will be able to share a path to achieve it, motivate people to take the journey with you, and assist them by removing any obstacles that appear on your way to process perfection.
Once you know what the outcome of the implementation is, you need to integrate the Lean mindset within your team.
Dealing with the human factor and getting everybody on board might be a major challenge. The Lean process is about delivering superior customer value by eliminating waste but also cultivating an environment of shared leadership where your team members receive more responsibilities and seek continuous improvement.
Once your colleagues understand that, they will be more likely to embrace the change. A good practice is to start with a single team and later spread the Lean practices across departments, eventually transforming your whole company into a Lean organization.
If you are working at an enterprise-level, you should form a temporary pilot group of members of different teams so they could serve as change agents after they return to their original teammates.
For example, if you have a large RnD department that consists of multiple teams working independently, you should ask for volunteers from each team.
A good way to ensure that they will be fitting change agents is to select only people who are not only enthusiastic but are influential in their teams e.
Once you set the strong foundation, introduce the 5 principles of Lean management. Nonetheless, you have the responsibility to enlighten your team and help them understand why each one of the Lean principles is important with the goal of eventually embracing them as a culture.
You need to distinguish the value-adding from waste activities. It is crucial for everybody to be on the same page about it so this should be a collective activity.
To understand what value is, consider the end product of your efforts and what your customer gets from it.
By definition, value is everything that your customer is paying you for. There are teams, however, that are not producing a direct value for the customer of the company but are enhancing the overall value that the organization delivers e.
QA teams. In this case, the customer is your company. Lean identifies 7 types of waste. Waste activities can be categorized as pure and necessary.
The main difference between them is that some waste activities are necessary to support the value-adding ones while pure waste activities only bring harm to the Lean flow of work.
Going back to the software development example, quality assurance is the brightest example of a necessary waste. In Lean management, this is usually done with the help of Kanban boards.
The Kanban board is a tool for mapping every step of your process and therefore visualizing the value stream of your team. Developed as part of the Toyota production system , which laid the foundations of Lean management, the basic Kanban board is a vertical flat surface divided by columns for the three primary states of any assignment:.
Although visualizing your workflow this way is a good start, you should consider mapping your process more precisely by including the steps that compose each stage.
For example, a "Requested" stage may have two steps — order received and ready to start. Usually, "In progress" consists of the greatest number of steps.
In the software development context, you would normally have steps like tech design, development, testing, and at least a couple of review stages.
When mapping your value stream for the first time, you should focus on value-adding steps in order to create a Lean process. Be sure to correct it occasionally as your process evolves.
In the world of Lean, flow is a key concept. Since any kind of waiting is a waste, when creating a flow of value, your goal is to ensure smooth delivery from the second you receive an order to the moment when you deliver it to the customer.
A major impediment to creating a smooth flow are the bottlenecks in your process.