Java-based websites are usually heavier and can affect the loading time and performance of the web page. They are mostly used to provide better functionality to the website for which you need to compromise on some other aspect of the website.
Let us go step by step and start the process at the URL.
Crawling refers to a process in which the search engine sends its Bot to the web page to fetch its details so that they can rank the page accordingly. The work of the crawler is to send the request to the server for the header and contents of the file.
There are several tools such as URL Inspection Tool that can help you see how Google crawls through your web pages. The request most likely comes from mobile user-agents as Google mostly uses mobile-first indexing instead of desktop indexing.
There are a few websites that may block the external visitors on the site and hence end up blocking Google crawler. Hence they use user-agent detection software to make their content visible to a specific crawler.
Resources and Links
Google does not check and read the web pages as a normal user does. It looks for the links mentioned in the pages and also the files that help in building the website. On identifying the links, the links get stored and transferred to the crawl queue for further processing.
Google, when downloads the files, converts them to HTML and then sends further for rendering. Content that is redundant usually gets eliminated by Google before going to the render process. Using the app shell models, only a few code and content gets shown in HTML response. In many instances, pages start showing the same code on multiple websites.
It causes confusion, and the pages get identified as duplicates and are stopped from going to the render process. It mostly happens with newer websites that have similar code to that of any other existing website.
Every page that is downloaded by Google goes to the renderer, and a render queue gets generated. The problem with JavasScript SEO pages is that sometimes pages get converted into HTML, and they do not get rendered for weeks because of any small error or statement that Google is not able to pick. However, it happens only in a few cases and is not a very big concern.
Google’s web rendering service is highly efficient in studying the pages and various information such as being stateless, denying permissions, shadow DOM, and flattening light DOM. Rendering the files directly on the web is a complex procedure that needs a high amount of resources.
Google produces fast and efficient results, mostly because it is heavily relying on catching resources. Google caches files, pages, API requests, and any other information that they acquire.
Before sending the data to the renderer, they make sure to cache it for future reference. They never download every page that is being loaded, instead, use the cached resources for speeding up their process.
This technique is not the most reliable, as in some cases. The rendering process can go to an impossible state where the index version of the page still contains parts of the older files.
So whenever you update your files, make sure to generate new names for them so that Google does not confuse them with the data of older files.
No Fixed Timeout
There are a huge number of people that believe renderer waits for only five seconds to load your page. This is not true. As told above, Google uses cached files to generate the data. The renderer does not have any fixed timeout. It keeps trying again and again until no more network activity is detected where it stops its process.
What Does a Googlebot See?
Googlebot does not read the data as the user themselves read it. It does not have the power to click on things or scroll freely on the page. When we talk about content, if it is loaded in DOM, the Googlebot automatically reads the content.
It just adjusts the screen height and makes the height longer than usual to study the content. You can not hide the data from DOM. If data is present in DOM, it will be read, else it will give an error message of content missing.
When reading the data from mobile devices, it readjusts the screen size to study the data. For example, a screen size of 411×731 pixels in mobile phones will get converted to 12,140 pixels. In the case of desktop, the process is similar, and a screen size of 1024 x 768 pixels is converted into 9307 pixels.
It will be fascinating for you to know that Google does not paint the pixels in the rendering process. It uses additional resources for the page to finish loading and leaves it right there.
This is enough for them to understand the structure and layout of the page without the need to actually paint the pixels. The intention of rendering is to process the semantic information so that data analysis can be successfully done.
Google needs to balance the crawling of your site with every other site available on the internet. Hence, it uses a resource known as the crawl budget. There is a specific crawl budget for every website. It helps Google in prioritizing the request for the render process. Websites that have an abundant amount of graphics or dynamic pages usually crawl slower.
However, it is not a big problem for Google. The pages that Google loads do not have any specific state. Therefore, they aren’t using any previous file information and are not even navigating between the pages.
Many developers take it as a serious issue when they navigate between the pages, and there is no update in the canonical tags. It can be easily fixed using the History API tool that lets you update the state of the webpage. You can use Google’s testing tools to check how Google is viewing your page.
View-source vs. Inspect
You might have noticed this, when you right-click on a web page, you get options such as view page source and inspect. View page source shows you the information that the GET request would show.
It can be referred to as the raw form of HTML on your web page. Whereas the inspect option gives you the processed DOM after the transitions have been made. You can say that similar data is shown to Googlebot.
You can never rely entirely on the Google cache. It does not produce the same results every time. Sometime it may show information of initial HTML, and sometimes the information of rendered HTML. It wasn’t developed as a debug tool and was made to view the content in the case of a website crash or when your website is down.
Google Testing Tools
Although these tools do not present the data as it is seen by Google bots, it is extremely efficient in analyzing and debugging the data. Remember, these tools use the resources from real-time and do not use the cached versions of file like the renderer generally does.
These tools will present your data in the form of painted pixels that Google does not view in its renderer. However, you can use the tools to check if the content is DOM loaded. The tools are beneficial in making you find the blocked resources and console error messages that are helpful for the debugging process.
Checking your Content is Displayed on Google or Not?
Take a snippet of your content and paste it on Google to check if it is presenting your data or not. You can also use a phrase from your website and search on Google to see if your data is coming on the search page or not. If the data comes, it means your content is being seen by Google. Remember, by default hidden content might not be shown on the snippet on search engines.
Another possible option is dynamic rendering that is executed for specific user agents. It is not actually a rendering agent and is basically a walkaround. However, it may become beneficial for rendering certain search engines and social media bots.
If you want your pages to rank better, make sure to change the URL every time you update the content. As previously told, the same filename many times can create confusion, and data redundancy will not let your files get rendered successfully.
Do not Stop the Crawling
Google requires the data to be fetched and analyzed. If you haven’t provided your page the permissions to access the data by external sources, the site will block any external activity. This will stop Google from fetching your site information and hereby ranking it. So make sure never to block access to the resources of your webpage.
Duplicacy in Content
The solution to this problem is simple. You can choose a version of the file you want to get indexed and set canonical tags over it.
Lazy loading can be referred to as an SEO technique that limits the data been send to a renderer. Instead of sending all the files, it only sends data that is important and required for the process. There are various modules available for handling lazy loading.
Different frameworks use different modules to support the features needed for internationalization. They are usually ported to some other destination and include intl, i18n, or numerous times the same modules that are used for header tags. Hreflang is an example of internationalization.