Comprehensive analysis of the reasons why PHP website slows down

This article analyzes the reasons why the PHP+MySQL website opens slowly. Friends in need can refer to it and make improvements to improve the website access speed.

1. The database table structure is unreasonable When creating a MySQL database table, set the fields that are often used as query conditions as indexes, which can improve the query speed of data and thus improve the opening speed of the website.

2. The database query statement is unreasonable PHP+MySQL** site, often uses database select operations. When using select operations, be careful not to use select * from tablename easily, because such queries are slow and will occupy more memory, affecting the overall running speed of the PHP program, and thus affecting the opening speed of the website. It is recommended to use select query statements for specific fields, such as select fieldname from tablename. This query method will reduce MySQL execution time and improve efficiency.

3. PHP program redundancy When building a PHP+MySQL website, you will find that there are a lot of redundancies in some programs, which prolongs the program execution time. For example, repeated SQL query operations, repeated variable assignments, etc. When such a situation occurs, it is best to find professionals to help you optimize the program and improve the overall running time of the program.

4. PHP program reads and writes a large amount of disks The PHP+MySQL website program will perform a large number of disk read and write operations, especially disk write operations, which will occupy a large amount of disk IO and cause the program to run slowly. In serious cases, the server may crash. When encountering such a situation, you should try to reduce unnecessary disk write operations and perform related optimization operations on the disk, such as disk defragmentation, to improve the overall operating efficiency of the disk.

5. Use static pages as much as possible When using PHP+MySQL to build a website, try to use open source programs that can generate static pages, such as DEDECMS. The time to open a static page is much less than the time to open a dynamic page, because the 4 reasons mentioned above do not exist in static pages. But it will make you consume more disk space, because the generated static pages will take up a lot of disk space.

6. There are a lot of pictures or flash on the webpage When there are a large number of pictures or flash on the web page, it will also affect the opening speed of the website. Reduce the pictures or flash on the web page, or optimize and reduce the size of the pictures to improve the opening speed of the web page.

7, Server software I met a friend who installed several firewalls on the VPS. The VPS server was secure, but the opening speed of web pages was very slow. Try to avoid installing unnecessary software on a VPS or independent server to prevent the server from running slowly and causing the website to open slowly.

8. There is a lot of JS code on the webpage A large amount of JS code is also an important reason for the slow opening speed of the website, especially some unknown affiliate advertising codes, which have a very obvious impact on the website opening speed.

9. Excessively quoted content from other websites Including referencing pictures, video files, etc. from other websites. If you directly quote something from another website on the page, and that website is slow to open, or the page of that website no longer exists, then the opening speed will be very slow.

That’s it, you can analyze your own program to see what causes the website to slow down.