Reduced number of DNS lookups -
One key component that contributed to DNS lookup time is the physical DNS. Certain DNSs are slower than others or experience more heavy traffic.
In some cases, it may make sense to designate a specific DNS. While taking multiple trips around the globe on fiber optic cables may be fast, those milliseconds do add up over time.
There are many DNS options available; some work better than others. Free DNS options are often slow, while premium DNS providers generally have faster response times.
They have extensive infrastructure and data centers around the globe, which will minimize the impact DNS lookups have on website speed. More often than not, JavaScript files load third-party assets resulting in high DNS lookup time and increased overall page load time.
One easy method to improve your DNS lookup time is to defer parsing your JavaScript until users need it. While this technique sounds like a good idea for minimizing DNS lookup time, you need to be careful with it.
Avoid using an excessive number of DNS prefetching as they can cause severe performance issues. DNS prefetching is a resource hint that allows you to perform DNS lookups in the background, as the user reads the current page before making another request. This is used for links within the content.
It can reduce DNS lookup time and improve website performance since you end up using idle time to get a resource so that when the user does click on the link, it will load significantly faster. The easiest way to understand how DNS lookup times influence website performance is to benchmark your website constantly.
This will give you a better idea of what needs to be improved and where the bottlenecks are. Choose one that can measure more than DNS lookup times since you must track other key website metrics as well if you want to ensure the overall performance of your website. Download EBook.
Sematext offers a suite of monitoring solutions that will help you keep an eye on your entire stack, allowing you to focus on the more important aspects of your business.
One of the products is Sematext Experience , a real user monitoring tool that offers a simple way to track your DNS lookup time and other important website performance metrics like your TTFB, FCP, CLS, and many others more.
Get started with Sematext for free for 14 days or pick one of the many tiers that will perfectly fit your needs. Several factors can affect DNS lookup time, including the performance and availability of the DNS server, network latency, caching mechanisms, and the efficiency of the local DNS resolver.
Why is fast DNS lookup important? Fast DNS lookup is important for reducing the time it takes to load web pages and other online resources.
Efficient DNS resolution contributes to a better user experience by minimizing delays in accessing websites. How can I measure DNS lookup time? DNS lookup time can be measured using network monitoring tools or online services that provide DNS resolution time metrics.
Common tools include dig domain information groper and various online DNS testing tools. Start Free Trial. What Is a DNS Lookup Time? What Is DNS Lookup Time?
What Is a Good DNS Lookup Time? How to Reduce DNS Lookup Time There are several ways to minimize and improve your DNS lookup time.
Cache Files Locally To reduce the DNS lookup time, you have to decrease the number of times you request a resource from a third-party domain. Minimize the Number of CNAME Records CNAME records generate additional DNS lookups, which will result in more waiting time.
Use a Fast DNS Provider You can optimize slow DNS lookup times by upgrading to a faster DNS provider. Defer JavaScript Files More often than not, JavaScript files load third-party assets resulting in high DNS lookup time and increased overall page load time.
Use DNS Prefetching DNS prefetching is a resource hint that allows you to perform DNS lookups in the background, as the user reads the current page before making another request.
Run your WordPress site through a tool like Pingdom and determine if each request is really necessary. This is because an IP address can change frequently , whereas hostnames will not.
While simply reducing the number of domains hostnames is easier said than done, we recommend looking first at those with higher DNS lookup times. For example, in this site we tested below, we can easily spot that the DNS lookup time to the Crazy Egg tracking script was a lot longer than others.
This is most likely due to their DNS provider not being as fast as some of the others. This is one scenario where perhaps you could look at other providers such as Hotjar, who provide the same service, but perhaps are utilizing a faster DNS provider.
It can be very important when adding external services to your WordPress site that you evaluate their performance. One of the easiest ways to reduce DNS lookups is to move as many resources as you can to your CDN provider. If you run your site through Pingdom, you can see the total number of requests by domain.
As you can see in this example, There is one request to the host, and one to Google Analytics. By moving as many resources to the CDN as possible, this reduces the number of DNS lookups involved, therefore decreasing the load times. There will always be some external resources or services that require you load them from their servers.
But we recommend looking through your site. Many times, we see that WordPress users have a lot of resources not properly hosted on their CDN. Below are a few resources we often see that could be improved:. In this case, we recommend reaching out to the developer to ask them how you can load it from your CDN.
If you are using WordPress native comments you might have an additional lookup to secure. com to load the gravatars. One easy solution here could be to utilize the lazy load comments plugin. So in a sense, you are reducing the DNS lookup on first-page load. Make sure to check out our blog post on other ways to speed up comments.
With Google Fonts you have one extra DNS request to lookup fonts. com to grab the CSS file. You then have additional requests to fonts. com to download the font files. There are pros and cons of doing this, but check out our in-depth article on how to host fonts locally.
Font Awesome , Gravatars, and Google Fonts are just a couple examples of ways you can reduce DNS lookups by ensuring they are loading from your CDN. Are you currently loading everything possible from your CDN? Another tip on speeding up DNS is to use DNS prefetching. This allows the browser to perform DNS lookups on a page in the background.
You can do so by adding some lines of code to the header of your WordPress site. See some examples below. DNS prefetch is also supported by all major browsers except for iOS Safari, Opera Mini, and Android Browser.
Or if you are running WordPress version 4. If you defer the loading of JavaScript, this can prevent things from loading until after the document has fully loaded. Varvy has a great explanation of on how to defer JavaScript. An example he uses on his site is his Google Analytics script, since there is no reason for it to load above the fold.
In WordPress, you can use a free plugin like Async JavaScript to defer the loading of JavaScript. However, it is important to know that you will most likely have to go through and list any scripts which you would like excluded from having defer applied.
Because some JavaScript will be required to render above the fold. Async JavaScript is also fully compatible with the Autoptimize plugin. Make sure to also check out our in-depth post on how to eliminate render-blocking JavaScript and CSS.
There are additional records from providers like DNS Made Easy and Cloudflare which can help reduce the number of requests on the backend.
ANAME records give you the functionality of a CNAME record, but at the root level. The www has to first resolve to the hostname, and then resolve to the IP address. This requires two requests. With an ANAME record, you can skip one of these requests!
If setup correctly these can also be used in conjunction with a CDN. However, this is not always true. If the hostname is in the same DNS zone, the A record might be retrieved in the same request. Similarly to ANAME records, Cloudflare provides automatic CNAME Flattening at the zone apex or root for their customers.
Do you have any additional tips on speeding up DNS or reducing lookups? If so, we would love to hear about them below in the comments! Brian has a huge passion for WordPress, has been using it for over a decade, and even develops a couple of premium plugins. Brian enjoys blogging, movies, and hiking.
Connect with Brian on Twitter. Thank you Brian Jackson, for this detail information ,this is very helpful for me , expecting more articles coming days….. I used the dns prefetch script in the functions file of my WordPress site but it made no difference when re-testing with Pingdom, cleared all cache etc.
Why do the same domains keep reappearing like stats. com in pingdom results even thought I have used it? Hey Ian! It actually appears from Pingdom that using DNS Prefetch code has slowed my site down not sped it up?
Any ideas gratefully appreciated. The reason your site appeared to slow down is probably due to caching, not the prefetch code.
Check out our article on how to run a speed test. Thanks a lot for such informative post, leaned a lot my mental health site, speed is really low and I installed wp-deferred javascript plugin to speed up but it does not work. Thanks for the comment.
Typically 24 hours is OK. Greetings, I tested the DNS Pre-fetching code, but it caused production of duplicate content on my site.
What happened was that I made a change in the title of one of my blog posts. When I published the new version, the system made it a new, separate post. I removed the DNS Pre-fetching code. Hey Zennie! This sounds like you might have implemented the code incorrectly.
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You may unsubscribe at any time by following the instructions in the communications received. Home Resource Center Blog Domain Name System 8 Tips on How to Reduce DNS Lookups and Speed Them Up 8 Tips on How to Reduce DNS Lookups and Speed Them Up Brian Jackson , April 12, What is DNS Lookup?
How DNS works When you browse to a website, a DNS lookup has to be made for each domain that is requested before anything is downloaded. woff2 Even though there is a total of eight HTTP requests above, there are only three total unique domains.
DNS Lookups in Pingdom Below is how the above requests appear in the Pingdom website speed test tool. DNS cache in Pingdom DNS Lookups in GTmetrix Every website speed test tool works slightly different, but almost all of them calculate DNS lookup times for you.
DNS lookups in GTmetrix DNS Lookups in WebPagetest Here is an example using WebPageTest. DNS provider speeds Some of the providers above are also faster than others in certain regions, so it is important to determine where you need fast DNS lookup times, regionally or globally.
Reduced number of DNS lookups an often overlooked SPF DNS-lookup limit is exceeded, lookupz SPF PermError, aka SPF permanent Reduced number of DNS lookups, Redced returned. SPF PermError's can affect your email deliverability. Numver article explains what the Lookyps DNS-lookup limit is, lookpus the consequences are when Jumber SPF lookps falls foul of Appetite suppressants for women, and how to fix this issue using DMARCLY's Safe SPF feature. When you set up SPF on a domain, sometimes you run into some SPF permanent error along the lines of "SPF PermError: too many DNS lookups". This can be seen on an email server with compliant SPF support, or from an online SPF record checker. When "SPF PermError: too many DNS lookups" is returned during an SPF check, DMARC treats that as fail since it's a permanent error, and all SPF permanent errors are interpreted as fail by DMARC. According to the official RFC specification document RFC :. GTmetrix requires Oxidative stress-induced diseases to function lookkps. Please enable JavaScript in your lokups and refresh the page Calorie counting statistics ensure the best GTmetrix experience. Polyphenols and arthritis lookups add delays to the initial requests to a host. Making requests to a large number of different hosts can hurt performance. The Domain Name System DNS maps hostnames to IP addresses, just like phonebooks map people's names to their phone numbers. When you type URL www.
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