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What Causes Slow Website Speed and SEO Optimization Tips

#网站速度#网站测试#网站优化#seo优化251
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If your website is loading slowly and you're unsure how to fix it, here’s a step-by-step guide to diagnose the issue and optimize performance. **Global and Local Ping Testing:** - Use online tools to test speed globally. - Use the ping command locally to check server connection times and packet loss. **Common Causes of Slow Loading:** 1. **Insufficient Server Performance:** Upgrade to a better hosting plan (like VPS or dedicated servers) if needed. 2. **Network Bottlenecks:** If loading speeds vary by location, consider purchasing dual or multi-line hosting for better connectivity. 3. **Server Location:** Use a CDN to reduce latency by serving content closer to users. 4. **Website Security:** Poor security can lead to attacks that slow down access. 5. **Website Design Issues:** Check for inefficient code, large images, or excessive JavaScript that can slow down loading. **Optimization Techniques:** - **Image Optimization:** Reduce image sizes and use appropriate formats (like WebP). - **CSS Optimization:** Simplify CSS rules to reduce file size. - **URL Structure:** Add slashes to URLs to clarify directory requests. - **Specify Dimensions:** Set height and width for images to improve loading efficiency. - **Reduce HTTP Requests:** Minimize the number of objects requested by combining files and removing unnecessary elements. **Additional Tips:** - Remove unnecessary loading items. - Use fast widgets and static content where possible. - Place tracking codes at the bottom of the page to avoid blocking loading. By following these steps, you can significantly improve your website's loading speed and overall user experience.

If your website is loading slowly and you don't know how to fix it, this guide will teach you step by step how to troubleshoot the reasons for slow website loading and optimization techniques.

Global Ping Test

Website: Recommended 10 Global Free Website Speed Test Tools

Local Ping Test

Use the local ping command to check the connection time to the server and packet loss situation. A good-speed data center should have a packet loss rate of no more than 1%, a low ping value, and a consistent ping value.

Troubleshooting the Reasons for Slow Website Loading:#

1. Insufficient Server Performance#

The speed of server space is the hardware foundation for fast website loading and a prerequisite. Otherwise, even if your website pages are designed to be very "slim," the loading speed will still be compromised.
Solution: Contact your hosting provider to resolve the issue or switch providers.
Upgrade to a more efficient host, such as VPS or dedicated server, to avoid resource competition.

2. Bottleneck Issues Between Telecom and Unicom#

  1. If the speed of the space is inconsistent, sometimes fast and sometimes slow, or even sometimes inaccessible, it indicates that the space is unstable. You need to contact your hosting provider to resolve the issue or switch providers.
  2. If the speed is fast in some locations and slow in others, it may be a network line issue.

Telecom users accessing websites hosted on Unicom servers and Unicom users accessing websites hosted on Telecom servers will generally experience slower loading speeds.

Solution: If purchasing space, it is recommended to buy dual-line or multi-line space. This is not a new concept; most virtual hosting providers offer dual-line or multi-line space, which may be slightly more expensive but is worth it from a user experience perspective.

3. Server Location#

The farther the server is from the user’s physical location, the longer the data transmission time.
For example, servers located in the United States have slower access speeds for users in Japan.
Use a CDN (Content Delivery Network): A CDN can provide services based on the user's location, accelerating data transmission and reducing latency.
Enable CDN caching.
Enable browser caching and compression: Configure the server to enable browser caching and Gzip compression to reduce data transmission volume and improve loading speed.

4. Website Security Issues#

Poor website security may lead to attacks or encounters with malicious crawlers, which can affect normal user access and increase loading times.

5. Finding Issues Within the Website Itself#

Website issues include website program design, webpage design structure, and webpage content.

  1. Website Program Design:

    You can consult professionals in program design to check if the program's design structure is reasonable.

  2. Webpage Design Structure:

    1. If there are tracking codes, online customer service, or other JS codes in the website, check if they are placed at the end of the webpage code. Solution: It is best to place them at the end of the webpage code so that these codes execute only after the website code has finished loading.

    2. There may be erroneous code.

    Erroneous code that keeps loading or blocking can affect website speed.
    Another situation is when special effect JavaScript code is copied from other websites, which may not be fully copied, leading to many webpage errors and causing slow loading speeds.

    1. Try to minimize JavaScript effects.

  3. Webpage Content:

    1. Check if there are many large images on the webpage. You can use software like Photoshop or Fireworks to reduce the image size, slightly lowering the image quality, and find the best ratio between image quality and size.

    2. Check if there are large Flash files on the webpage.

    3. Some users like to add music to the webpage, causing background music to play as soon as the user opens the website. This should be avoided as much as possible.

    4. Excessive quoting of content from other websites. For example, if you quote images or other content from another website, if that website is slow or the page no longer exists, the loading speed of the webpage will be even slower.

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Methods to Optimize Loading Speed:#

1. Optimize Images#

Optimizing images includes reducing the number of images, lowering image quality, and using appropriate formats.

  1. Reduce the number of images: Remove unnecessary images.
  2. Lower image quality: If not very necessary, try lowering the image quality, especially for JPG format; a 5% reduction in quality may not show much change, but the file size reduction can be significant.
  3. Use script files instead of effects: Use JavaScript code to achieve effects, which only adds a few bytes.

2. Choosing Image Formats#

Use WebP format for images, as WebP format has good compression effects.

3. Optimize CSS#

Sometimes when writing CSS, we may use verbose statements, such as:
Code:

margin-top: 10px;
margin-right: 20px;
margin-bottom: 10px;
margin-left: 20px;

You can simplify it to:

margin: 10px 20px 10px 20px;

Or this:

<p class="decorated"> A paragraph of decorated text</p>
<p class="decorated">Second paragraph</p>
<p class="decorated">Third paragraph</p>
<p class="decorated">Fourth paragraph</p>

Can be contained in a div:

<div class="decorated">
<p>A paragraph of decorated text</p>
<p>Second paragraph</p>
<p>Third paragraph</p>
<p>Fourth paragraph</p>
</div>

4. Add a Slash at the End of the URL#

For some URLs, such as http://www.baidu.com/512, when the server receives a request for such an address, it takes time to determine the file type of this address.
If 512 is a directory, it is better to add a slash at the end of the URL to make it http://www.baidu.com/512/, so the server can immediately know to access the index or default file under that directory, thus saving loading time.

5. Specify Height and Width#

When adding images or tables to a webpage, you should specify their height and width, i.e., the height and width parameters.
If the browser does not find these two parameters, it needs to calculate the size while downloading the images. If there are many images, the browser needs to constantly adjust the page. This not only affects speed but also the browsing experience.

Once the browser knows the height and width parameters, even if the images cannot be displayed temporarily, space will be reserved for the images on the page, allowing the rest of the content to continue loading. This will make the website loading speed faster and improve the browsing experience.

6. Reduce HTTP Requests#

When a visitor opens a webpage, the browser will send many object requests (images, scripts, etc.), and depending on network latency, each object's loading may be delayed. If there are many objects on the webpage, it can take a lot of time.

Therefore, reduce the burden of HTTP requests. How to reduce the burden?#

  1. Remove unnecessary objects.

  2. Combine two adjacent images into one.

  3. Merge CSS files.

7. Other Small Tips#

  1. Remove unnecessary loading items.
  2. If you have embedded widgets from other websites, choose the ones that are fast if possible.
  3. Try to use images instead of Flash, which is also beneficial for SEO.
  4. Staticize content that can be staticized to reduce server load.
  5. Place tracking codes at the bottom of the page (or use lazy loading).
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