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なぜWordPressブログにCDNが必要なのか?[インフォグラフィック]

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CDNや「コンテンツデリバリーネットワーク」とは何なのか、なぜサイトにとって重要なのか、疑問に思っていませんか?

WordPressサイトの高速化をお考えなら、CDNは非常に価値のあるツールです。さまざまな場所にいるエンドユーザーに素早くコンテンツを配信し、ユーザー体験を向上させます。

この投稿では、WordPressブログにCDNが必要な理由をご紹介します。

Why Do You Need a CDN for Your WordPress Blog? [Infographic]

インフォグラフィック

What is a CDN and Why you need a CDN

CDNとは何かについては、上の画像をクリックしてインフォグラフィックをご覧ください。詳細については、投稿をお読みください。

注:明確にしておくが、CDNはウェブホスティングアカウントを持つことに加えて使用するもので、スピードアップに役立つからだ。

CDNは、SiteGroundや Bluehostのようなホスティングサービスを提供する必要があるため、ウェブホスティングアカウントの代わりにはなりません。

CDNとは?

CDNとは、コンテンツデリバリーネットワークの略で、ユーザーの地理的位置に基づいて、ウェブサイトからユーザーにキャッシュされた静的コンテンツを配信するサーバーのネットワークである。

もし、これが圧倒的に聞こえるなら、もっと簡単な言葉で説明しよう。

CDNはどのように機能するのか?

通常、ユーザーがWordPressブログにアクセスすると、ブラウザーはBluehostSiteGroundHostGatorなどのウェブホスティングサービスのサーバーからサイトをダウンロードします。ウェブホスティングサービスのサーバーは、テキサス州ヒューストンなどの物理的な場所にあります。

これが意味するのは、すべてのユーザーがWordPressサイトを表示するために、テキサス州にあるこの1つのサーバーにアクセスしているということです。トラフィックが多い場合、サーバーに負荷がかかり、サイトの読み込みが遅くなったり、サーバーがクラッシュしたりする可能性があります。

そこで便利なのがCDNだ。CDNとは、世界中に散らばるサーバーのネットワークである。CDNを利用すると、静的コンテンツはすべてこれらのサーバーにキャッシュされ、保存されます。

How does a CDN work

静的コンテンツには、画像、スタイルシート(CSSファイル)、JavaScriptなどが含まれます。ユーザーがサイトにアクセスすると、CDNテクノロジーはユーザーの所在地に最も近いサーバーにリダイレクトします。

例えば、あなたのメインサーバーがテキサス州ヒューストンにホスティングされているとして、イギリスのダラムにいる人がアクセスしようとすると、一番近いサーバーにリダイレクトされます。

これにより、静的ファイルをエンドユーザーに送信するために必要なインターネットホップ数が制限されます。ユーザーのコンピューターとCDNサーバーの位置が近くなるため、ファイルの読み込みが速くなります。

世界中の複数のサーバーでコンテンツを利用できるようにすることで、ユーザーから見たページの読み込みを速くすることができます。簡単に言えば、CDNサーバーがユーザーのいる場所に近ければ近いほど、そのユーザーはより速くコンテンツを得ることができるのです。

自分のサイトにCDNを導入する価値があるのかどうか、疑問に思っているかもしれない。WordPressブログにCDNが必要な理由を見てみましょう。

なぜWordPressブログにCDNが必要なのか?

CDNを持つことで、サイトのパフォーマンスに影響を与え、ユーザー体験を向上させることができます。以下はCDNを使用する利点の一部です:

  • スピード– CDNは、サイトのページ読み込み時間を改善し、より速くするのに役立ちます。
  • クラッシュへの耐性– CDNを使用することで、メインサーバーへのトラフィックを100%にする代わりに、複数のサーバーに負荷を分散することができ、クラッシュしにくくなります。
  • ユーザーエクスペリエンスの向上– CDNによってサイトが高速化されると、サイトの直帰率が低下することに気づくでしょう。また、各ユーザーが表示するページ数も増加します。明らかに、高速サイトはユーザー体験の向上を意味します。
  • SEOの向上– Googleは、より高速なサイトは検索エンジンで上位にランクされる傾向があると述べています。CDNはWordPressのSEOを強化し、より高いキーワードランキングを達成するのに役立ちます。

WordPressに最適なCDNは?

市場には多くのWordPress CDNサービスがあります。私たちは、あなたのWordPressサイトに使用する最高のCDNプロバイダーとしてBunny.netをお勧めします。Bunny.netは世界中にサーバーがあり、手頃な料金プランを提供しています。

セキュリティ機能も提供するCDNサービスをお探しなら、Cloudflareの利用をお勧めします。Cloudflareは、強力なWordPressファイアウォールとCDNを提供し、高速なロード時間を確保しながら、さまざまな脅威からサイトを保護します。

Sucuriは、セキュリティ機能を提供するCDNのもう一つの素晴らしい設定です。しかし、WPBeginnerがSucuriからCloudflareに切り替えた理由については、こちらの投稿をお読みください。

WordPressのパフォーマンスに関連するエキスパートガイド

CDNがどのようにサイトを高速化するかがおわかりいただけたところで、WordPressのパフォーマンスに関連する他のガイドもご覧ください:

この投稿が、WordPressブログにCDNが必要な理由を知る一助となれば幸いです。また、WordPressサイトの無料SSL証明書の取得方法や、専門家が選ぶビジネスサイトに最適なWordPressプラグインもご覧ください。

If you liked this article, then please subscribe to our YouTube Channel for WordPress video tutorials. You can also find us on Twitter and Facebook.

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Editorial Staff at WPBeginner is a team of WordPress experts led by Syed Balkhi with over 16 years of experience in WordPress, Web Hosting, eCommerce, SEO, and Marketing. Started in 2009, WPBeginner is now the largest free WordPress resource site in the industry and is often referred to as the Wikipedia for WordPress.

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Reader Interactions

103件のコメント返信を残す

  1. Syed Balkhi says

    Hey WPBeginner readers,
    Did you know you can win exciting prizes by commenting on WPBeginner?
    Every month, our top blog commenters will win HUGE rewards, including premium WordPress plugin licenses and cash prizes.
    You can get more details about the contest from here.
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  2. Dennis Muthomi says

    I’m actually planning to migrate my WordPress site to a new hosting provider soon. I’m wondering…will my CDN keep my site up and running during the transition, or will things go offline until the migration is complete? I’d love to minimize any downtime, so if you’ve got any tips

  3. Mrteesurez says

    Thanks for this explanation, actually I didn’t know what CDN is actually is and how it works but this guide has explained it in details. Thanks.
    I want to ask: Does using wp super cache, total cache is sufficient for CDN features.

  4. Kam says

    Thanks for this helpful article.

    I am with Bluehost and recently I selected CDN and noticed that my website was loading much faster. But, some users could not access my website as the following message came up:

    ERR_SSL_UNRECOGNIZED_NAME_ALERT

    I got Bluehost to revert back to my original setting. Is their a way around this?

    • WPBeginner Support says

      You would want to reach out to BlueHost’s support and they should be able to assist.

      管理者

  5. Jim Boult says

    Thank you for clarifying the purpose of a CDN. A very straightforward and easy to understand explanation. wpbeginner is a great resource and I’m starting to appreciate your value to the WordPress community!

  6. Gagan says

    Can you please compare some Free CDN service for low traffic site which can’t afford services like MAX CDN. Cloudflare, Incapsula and Amazon are offering free cdn but don’t know which one to choose.

  7. Erwin says

    Thanks for interesting post.
    If I understand it correctly CDN is useful for websites with international orientation, but not for websites with a national user base. I am located in the Netherlands (small country), and my website is focusing on people in the Netherlands. Am I correct that CDN is not going to improve loading speed for my customers?

  8. Kawsar says

    If you expect to get 2/3 k user maximum per day you never need CDN. It do not improve any performance . just choose a good hosting and fast theme.

  9. Swati says

    Thank’s for this article .it was easy to understand. I just wanna know how much does it cost .the basic price. I am from India.

  10. Weedney Desmornes says

    I have a MacBook Air and I do not want to overload it with files and downloads because the MacBook Air is not designed for that. Is there any way I can begin a website without overloading my computer?

  11. Ishaan Mehta says

    hey..i wanna use cloudflare..
    but they require to changes nameservers..will it cause any problems to d original hosting if i point domain nameserver details to cloudflare, n not to hostgator? or it will just work out automatically..? i m using wordpress 4.4.2 btw..plz reply..i need ur help! :-)

  12. Krishnandu Sarkar says

    Can I increase Default Cache Time to 12 month in MaxCDN? As the images, css, js that I have will never change. Yes I may add more images as I add more posts. But existing ones will be same as usual forever.

  13. shailaja says

    I registered cloudflare cdn to my . but all static files are not hosting by cloudflare. why any cloudflare settings is require.

    • Fritz says

      Fatt Kay, CloudFlare is free.

      To WPBeginner: “Why You Need a CDN for your WordPress Blog” is not a question and should not have a question mark. “What the heck is a CDN” is a question and should have a question mark. Nit-picky? Maybe, but mistakes like this are jarring to some of us, and detract from the value of your content. :-)

  14. Germain says

    so i think i going to singup with justhost.com and i saw that them had a global cdn my question is if anyone know if that service its automatically activated or not?

  15. Alex Mega says

    How much total bandwidth would you recommend to purchase? Where could I find out how much bandwidth we go through on a regular basis. I mean traffic wise I’m sure it depends on location of users. So as a company that may see 100,000 page views/50k visitors or more a month is 100GB of bandwidth enough?

  16. Lazy Sapper says

    I have been using Cloudflare for CDN. But unfortunately, I don’t see decline in the consumption of CPU resources.

  17. Syed Balkhi says

    Just updated the article.

    To answer your question: No CDN does not replace a hosting account. It works with your hosting provider to balance the load and speed things up. You still need a web hosting provider.

  18. Naval says

    What do you think about this cdn speed test tool at spooster.com? Should I follow their recommendation if I choose to go for a free solution?

  19. Mark says

    I would recommend going with high quality hosting with your own static IP address and reliable hosting/page refresh rates before using CDN.

    It’s my understanding that Google ranks sites based on their geographic targeting. Google seems to be focused on providing the best rankings for the smaller businesses in their local markets. This also improves Google’s advertising revenue by having many more sites competing for the same category advertising keywords.

    Larger companies are able to have multiple websites in multiple geographical locations and can more easily globally dominate ranking categories.

    It’s not clear to me that CDN provides a valuable multiple geographical location presence?

    Please comment on how CDN would improve say… your UK search engine ranking (UK visitor traffic) for example if your geographic target was the US?

    Thanks.

  20. William V. says

    Great overview on what a CDN is and how it works.

    I just wanted to add one note… CDNs don’t only accelerate the delivery of static content, but also dynamic content (any content generated in real time by the origin server— e.g. applications) as well. Dynamic content is not cachable, but CDNs can speed up the request and returns from the server through a series of proxy servers/nodes strategically placed around the world… basically creating a more direct route for the data packets to travel through. Traditional internet protocols require that data packets travel through more connecting points, which delays the arrival of data packets… making it slower to load on the client.

    Cheers,

    • Ryan Williams says

      Not sure this is right. I’ve conducted tests with every major CDN out there, and in all cases it’s significantly slower accessing uncacheable dynamic pages rather than just going to the origin server directly.

      However, it is true that dynamic pages can too benefit from a CDN. The key is to use a CDN that allows almost instant purging, so you have it cache everything and then your application can send a ‘purge’ request to the CDN when it knows an update has occurred (e.g. new post or comment). Of course, this requires specific integration.

      • Sander says

        Actually, if the majority of the page is loaded via CDN content, and the dynamic part of the page is loaded via AJAX, a CDN could considerably increase the speed of a true dynamic page. Obviously, after the page is loaded, a CDN would not help increase the speed of the next AJAX load. But to an uninformed user, the feel of the website would be generally quicker with a CDN than without a CDN.

  21. Pritush says

    Now wordpress offers free CDN with Jetpack plugin.. how efficient is that compared to paid CDN like maxcdn ?

    • WPBeginner Support says

      We will probably do a comparison in some article. However, we would still recommend MaxCDN. Installing jetpack in self-hosted WordPress requires you to connect your WordPress site to WordPress.com and many users don’t want to do that. Also Photon just serves images it calls itself image acceleration and editing service, not a CDN.

      管理者

  22. Hemant Aggarwal says

    Your website was down because of HostGator’s server issue. Does any CDN provides caching of web pages too?

  23. Alan says

    Hi, can you tell me if the servers all over the globe have static pages and you update a static page, how long does it take for the servers to update that page? Can you force and update of static pages, and how do you do that? Thanks

  24. Forever Long says

    Hello,

    I can see this blog entry is a few months old now, however I have just completed building a site on Wix and its sole purpose is e-commerce hopefully on a global scale. Problem is however we have noticed for a while that the website was sluggish during building and still is after going premium and adding more bandwidth. Can MaxCDN solve our problems? Wix only ever gives out canned responses such as “you must compress images” and “please disable the auto rotate function from your slideshow” this is aggravating to say the least. this is the website in question

    would be really grateful for your thoughts and assistance i’ve spoke to MaxCDN and they said they can help, however you never know whether its a sales pitch?

    • Jen Street says

      I have created a few sites using Wix, including my own portfolio site. I offer it to clients who want a very simple site with few updates that is cheap. I plan on moving my own site to WordPress. After learning to create in WP, although with each theme it’s like having to relearn how that specific theme operates, I highly recommend WordPress and find it to be my preferred platform to develop websites from.

  25. David says

    Just wondering, can your use two CDNs at once, like MAXCDN and Cloudflare?, what are the consequences? is it feasible?

  26. TechZoomOrg says

    Hi. I am using CloudFlare & WP Total Cache. Now, can we still get maxCDN working for the same site? Will it make a significant difference?

    What would you differentiate & suggest for people using CloudFlare for their WP sites.

    Eager to explore more. Thanks :)

    • wpbeginner says

      @TechZoomOrg If you are using CloudFlare then you don’t really need MaxCDN. From our understanding it is an either / or solution.

      • Raulnayak says

         @wpbeginner  Actually,Cloudflare doesnt affect the website as much as MaxCDN, I would recommend that you use both MaxCDN as well as cloudflare and it will be very fast!!

  27. wpbeginner says

    @kath.gamboa First of all the idea is that CDN service will not go down because they have so many datacenters across the globe. But lets imagine the worst and say that if it does go down, then all you have to do is go into your W3 Total Cache plugin, and turn off CDN for that time. All of your content will then be served directly from your server.

    Remember, you never upload any content directly to the CDN servers. You always upload it to your web hosting server, and CDN simply mirrors it.

  28. kath.gamboa says

    What happens when the CDN service goes down? Does that mean that the website’s static content will be inaccessible as well? If yes, are there ways to revive the website when the CDN service goes down?

  29. PeterApalais says

    Okay how does it work. I am with hostgaor. I want faster page loads etc. I personally live in Australia. So there is is delay because of that huge big distance the information has to travel. Okay for someone who lives next to the server in the USA, but not ideal for here in OZ.

    1. Does MaxCDN have a server here in Australia?

    2. What about Amazon S3, do they have a server in Australia?

    3. Does anyone?

    4. Does the CDN have copies off everything that is on my website. So like the HTML files as well? If so, maybe a work around for me would be to get a web host based here in Australia. This will allow fast loading here, then use the CDN for the rest of the world.

    5. So I guess, if I am browsing from the England, will it pull everything from the England server, and nothing from the hostgator server back in the US??

    Peter

    • Raulnayak says

       @PeterApalais I think yes,its der In sydney or its being planned.. See here, http://www.maxcdn.com/features/network/  .. I would recommend MaxCDN because they charge on pay-as-you go basis i.e as $ 40 per 1TB of data… Amazon is costly. It mirrors the whole website and creates cache or the websites so in the event that the server is down,the website doesnt go offline.. I personally use it for my http://www.allcancook.com

  30. wpbeginner says

    @AstroGremlin Doesn’t matter how big the site is, CDNs will help regardless. But if the small site is your personal site, then it is probably not worth you having the CDN.

    • Raulnayak says

       @wpbeginner Actually,the best part of MaxCDN is that it doent matter how big or small your website is, It has a wonderful pay-as-you go plan where you have to renew only when you are done using the 1 TB you bought.. So if the 1 Tb doesnt get used up even after 2 years, its fine,the plan will go on… 

  31. AstroGremlin says

    I notice that the rate one pays depends on volume (which seems very fair). But how can I tell how many gigs my blog is serving up? Also, does CDN makes sense for a really low traffic site?

    On caching: I tried W3 but it was causing conflicts. I switched to Supercache and haven’t looked back.

  32. Peter says

    Hi,

    I have a question, is there any alternative plugin to use with WordPress and MaxCDN other than w3totalcache ?

    w3totalcache is causing some memory problems on my VPS server ?

    • Jason H says

      WP-Super Cache is a bit simpler to use that W3 Total Cache and has a tab to configure Origin-Pull CDNs. Otherwise, you can use another plugin in conjunction for Push CDNs but I would recommend Origin-Pull be a requirement of the CDN you go with.

  33. Bob says

    I on a bluehost shared server and was thinking about paying extra for a static ip address – would a static ip address increase my website speed?

    But now reading this I wonder if I should bypass the static ip address and just go for a CDN solution instead?

    I have done all the minifying, caching, etc, so did assume the next step was a static ip address. But perhaps it is really a cdn solution that I need?

  34. Peter says

    Hi,

    Could please provide some more info about those two cases:

    Improved User Experience – Since we started using a CDN, we have noticed a decline in bounce rate on our site. Furthermore, we have also seen increased in pageviews and numbers of pages viewed by each user. So clearly a fast site means improved user experience.

    Improvement in SEO – Google has clearly stated that faster sites tend to rank higher in Search Engines. We have noticed our site ranking higher once we did the optimization on our site.

    Something more, like how your counce rate and pageviews changed ?

    SEO in Google, how fast can you see something changes, by traffic monitoring or how come ?

    Tnx , I am happy CDN user from yesterday with your coupon as well.

    • Editorial Staff says

      When we optimized our site for speed, the site went about 240% faster. We saw a huge decline in bounce rate as people were not just exiting on the first page. They were going to other pages as well which means increase in pageviews. Clearly the user experience must have been improved by the faster site. Because we did not change the placement of related links or anything. Those were there before and after.

      In terms of google, it has been stated that the faster your site is, the more pages will get indexed per day.

      管理者

      • Peter says

        Tnx for fast response to my comment.

        After implemnting CDN to my sites the onlu problem that i have is i cannot test how much faster it goes now.

        Pingdom is not working now, YSlow in Firefox also stops to work.

        How you test your site if i may know.

        Tnx

        • Peter says

          Hi,

          Ok, listen to my horror story.

          After implemnting some CDN to my couple of WordPress websites, what i mean implement, delete old cache systems on those sites and installed W3 Total Cache plugins.

          I setup evrything as it should be and go to sleep.

          Now from this morning i have big problems with my VPS server.

          Don’t know what is going on but my CPU is from time to time (short period of time) goes like 100% , memory is bigger & bigger, swap is starting to work… tasks are going from normal about 60 to 100 or even more.

          Anyway i am fighting with this one almost 10 hours without sucess. I reboot server, soft&hard and make many stuff but nothing seems to work.

          In past server was not doing nothing almost , now it is extreme busy.

          I think this is too much for me and i need to find WordPress+Linux pro who will help me with that problem.

          Cheers

        • Gigi says

          Delete w3totalcache and try w-supercache, i have deleted w3 and with wpsupercache my site is loading more fast.

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