When a website is running slower and slower, the following issues usually need to be analyzed and optimized:

1. Insufficient server resources: If your server resources (e.g., CPU, memory, storage, and bandwidth) are insufficient to handle user requests, your site may become slow. You may consider upgrading your server or using a solution such as a load balancer to spread the traffic pressure.
2. Large number of HTTP requests: The loading time of a web page depends greatly on the number of resources contained in that page, such as JavaScript, CSS, images, etc. Excessive HTTP requests can lead to longer loading times. You can consider reducing the number of HTTP requests by merging files, caching, using a Content Delivery Network (CDN), etc.
3. Inefficient Database Queries: If your website relies on a database, the efficiency of database queries may affect your website response time. You can consider using indexes, optimizing queries, and reducing the number of queries to improve database query efficiency.
4. Poor code quality: The quality of the code has a significant impact on website performance. Optimizing the code can reduce the burden in terms of execution time, memory usage and network transmission. You may consider using caching, compression, reducing duplicate calculations, etc. to optimize the code.
5. Third-party services: If your website uses third-party services, such as advertisements, social media, analytics, etc., then these services may increase page load times. You may consider delaying the loading of these services or using asynchronous loading to reduce the page load time.

In response to the above problems, here are some common optimization methods:

1. Server optimization: upgrading server hardware, using load balancers, optimizing databases, and other methods.
2. Cache Optimization: Use browser caching, server caching, CDN caching, etc. to reduce the number of HTTP requests.
3. Compression Optimization: Compressing files, reducing image size, reducing code size, etc. to reduce the amount of network transmission.
4. Code optimization: using efficient algorithms, optimizing queries, using caching, etc. to improve code performance.
5. Asynchronous loading: delayed loading of third-party services, use of asynchronous loading to reduce page load time.

Finally, there are tools you can use to help you analyze and optimize your website, such as Google PageSpeed Insights, YSlow, WebPagetest, and more. These tools can provide you with detailed performance reports and optimization suggestions.

I hope this blog tutorial will help you optimize the performance of your website.