Website operation five styles: let speed fly
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There are many factors affecting the speed of website access. Apart from objective reasons such as the hardware configuration of the website server and the quality of the bandwidth of the computer room, the neglect of the attention to detail in the website construction is the main reason for the slow operation of many websites. Let's take an example. Many websites now have plug-ins for traffic statistics analysis, and this plug-in is not from the website itself, but is provided by third-party service providers. For accurate statistics, the commonly used method is to insert a third-party statistical code (usually a JS program) into the user's website, and many statistical programs require that this statistical program be inserted into the beginning of the website code. The website code is loaded line by line and will stop if it encounters a place that cannot be loaded. This means that if there is a problem with the statistics server, it will cause the website using statistics to be unavailable for a long time. This is just an example. There are still many subjective “negligence†factors that affect the speed of the website. We will analyze the main aspects as follows:
First, the website code is simple and standardized
Most websites are now developed in dynamic languages. Whether it is ASP or PHP, it is necessary to use the database in order to maintain and update the website later. First of all, the read and write of the database itself takes time. The more important factor is that if the code is not standardized, such as the lack of database shutdown statements, it will greatly affect the site loading speed. Similar mistakes are also used by looping statements, causing the website to run slower and slower after an infinite loop. The solution to this kind of mistake is to standardize the program, and the second is to generate a static html page as much as possible, so that even if there is a problem with the website program, it will not affect the normal access of the user. In addition, a large number of redundant code and redundant code, Html unreasonable JS and CSS fragments, will also reduce the efficiency of the implementation of the website program, affecting the access speed of the website.
Second, the super large resource asynchronous loading
A page, the program code is no more than a few hundred kilobytes, but a picture or an animation of a video piece of music, it may exceed a few megabytes. To know that China's average bandwidth is only about 2M, its downlink rate is about 200KB on average, and a picture of about 1M will take 5 seconds to load. And how can a website be a picture? So pictures, animations, and audio and video files are also important reasons for the speed of website visits. This seems to be a headache, but now there is a perfect solution. Everyone has seriously thought about it. Almost all portals have a lot of pictures and animations, but why is this website opening so fast? The secret is to properly control the size of the image and take the mode of asynchronous loading. The so-called asynchronous loading is easy to understand, that is, these large portals have separate image servers, website code programs and website image animations, which are simultaneously retrieved from different servers. In addition, the pictures on these websites are strictly compressed according to the display browsing standard to control the size, which also increases the loading speed to a certain extent, and is not limited herein.
Third, the host space is reasonably configured
In order to get fast access to the website, the first thing to do is to improve the hardware configuration of the server. The reason is very simple, just like why the general computer is more than a few programs open, the running speed is very slow, the web server is also a special computer. In addition to the hardware configuration of the website server, the line of the equipment room and the quality of the bandwidth will greatly affect the speed of website access. This is why we have been recommending users to choose BGP multi-line servers for mainstream access, because at least interconnecting is still a serious problem in China. The hardware configuration is related to the speed of the website, and the software is the same. For example, if the server starts Gzip, the data output to the user's browser will be compressed after the Gzip is opened, which will reduce the amount of data transmitted through the network and improve the browsing speed. There are also CDN accelerations used by some of the largest website operators, and if conditions permit and are necessary, they are some good choices.
Fourth, domain name resolution is straightforward
When it comes to website access speed, more than 90% of people think of the website server configuration, computer room quality and website program. In fact, there is another factor that is ignored by many people, which is the DNS resolution of domain names. Because the program can only identify the IP address, but the IP address is composed of a series of numbers, the domain name resolution server is required to complete the binding of the domain name to the IP. The unstable DNS resolution server directly affects the unstable speed of the user after the domain name belongs. In the operation of domain name resolution, there is still a detail that is overlooked by many people. When the domain name is parsed, the A record is used to resolve the IP address, or the Cname is used to resolve the alias. Shanghai Network Company Pilot Technology believes that the access speed and stability of directly parsing domain names to IP addresses is higher than alias resolution. Because the IP address directly corresponds to the website server, and the alias resolution is to bypass the resolution server of the website host alias, the detour will of course affect the speed and stability of the website. In terms of domain name resolution, maybe we just saved a few milliseconds, but it always has a positive effect on improving the speed of website access.
5. External resources are carefully quoted
To get back to the beginning of this article, the use of third-party plug-ins is often the main reason for slowing down website access. The author has a personal experience, listen to the website traffic statistics provider's suggestion, the statistical code is placed at the top of the website code, only because a small icon is not loaded, resulting in the website can not be loaded and run for a long time. Now there are a lot of third-party website plug-ins, and its implementation is nothing more than the implementation of statistical URL links or JS program calls, which has hidden hidden dangers for website access speed and stable operation. Therefore, we must be cautious when referring to third-party website plug-ins such as traffic statistics analysis and online customer service, and we should place these reference codes at the bottom of the website program as much as possible. This will not cause too much impact and interference on the operation of the website even if the referenced code does not load.