1. Use performance analysis plug-in to quickly locate problems. For example, Query Monitor can view the number of database queries and PHP errors, Blackbox Profiler generates function execution reports, and New Relic provides server-level analysis; 2. Analyzing PHP execution performance requires checking time-consuming functions, debugging tools usage and memory allocation, such as Xdebug generates flame graphs to assist in optimization; 3. Monitor database query efficiency can be checked through slow query logs and index checks, and Query Monitor can list all SQL and sort by time; 4. Combining external tools such as Google PageSpeed ??Insights, GTmetrix and WebPageTest to evaluate the front-end loading performance, and found problems such as JS being too large or image not compressed. Follow the above steps to conduct a comprehensive analysis of WordPress performance bottlenecks from plug-ins, PHP, databases to the front-end.

If you find that your WordPress website is slowing down, or want to check performance bottlenecks in advance, it is very necessary to do a performance analysis (profiling). This will not only help you find out the specific reasons for slowing down the website, but also provide direction for subsequent optimization.

1. Use the Performance Analysis Plug-in

The easiest and most users will be to use professional performance analysis plugins. These plugins can record every link of the page loading, helping you see which parts take the most time.

Several commonly used plugins are recommended:

• Query Monitor : Check the number of database queries, execution time, and PHP errors and other information.
• Blackbox Profiler : Generates a detailed call stack and function execution time report.
• New Relic / AppOptics Integrated Plug-in : If you have paid performance monitoring services, this type of plug-in can provide more in-depth server-level analysis.

After installation, enable the plug-in and visit your website page, you can see detailed performance data in the background. For example, Query Monitor will display a panel at the bottom of the page, telling you how many database queries were used for this request, how many hooks were loaded, how many PHP functions were executed, etc.

2. Analyze PHP execution performance

WordPress is a PHP-based system, so performance issues at the PHP level are often the key. You can locate the problem by:

• Check if there are long-running functions or hooks , such as a plugin that does a lot of processing in init hook.
• Check whether debugging tools like Xdebug or Blackfire are enabled, which can generate flame maps to visualize performance consumption.
• Pay attention to memory usage . Some plug-ins may continuously allocate memory in loops, causing the script to run slower and slower.

For example: If you find that a plugin executes dozens of database queries each time the page is loaded, then this plugin is likely to be the source of performance bottlenecks. At this time, you can consider changing the plug-in or contact the developer to make optimization suggestions.

3. Monitor database query efficiency

Many operations of WordPress will eventually fall on the database. If the database response is slow, the entire page will stutter.

You can start from the following aspects:

• Check whether there are duplicate or redundant queries , such as the same data being retrieved multiple times.
• Check for unindexed fields , especially in custom queries.
• Use slow query logs to identify SQL that has long execution time.

The Query Monitor plug-in is especially useful in this regard, listing all executed SQL queries and sorting them by execution time. If you find that a query is particularly slow, you can copy it and optimize it separately.

4. Use external tools to assist in analysis

In addition to WordPress internal plug-ins, you can also use some external tools to obtain more comprehensive data:

• Google PageSpeed ??Insights : Analyze front-end loading performance from a browser perspective.
• GTmetrix or Pingdom : Provides waterfall diagrams to show the order of resources loading and time-consuming.
• WebPageTest : Supports multi-region testing, and can see the loading speed of the first screen, request blocking, etc.

Although these tools do not directly analyze PHP and databases, they can give you feedback from the perspective of the user's real experience. For example, you will find that JS files are too large, images are not compressed, and CSS rendering blocking will also affect the overall performance perception.

Basically these methods. Performance analysis sounds a bit complicated, but in fact, just take it step by step, first check the plug-in data, then look at the database and PHP execution, and finally confirm the results with external tools. The problems can usually be found. The key is not to look at the surface, but to dig deep into the underlying logic.

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