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Websites run slow on IIS, which are usually related to application pool configuration, error request processing, module settings, and server resources. 1. Check the application pool settings to ensure that the recycling frequency is reasonable, the startup mode is set to AlwaysRunning, and turn on preloading; 2. Check the logs and wrong requests, locate problems such as slow SQL or frequent 404; 3. Adjust the IIS module and compression settings, disable unnecessary modules and enable dynamic content compression; 4. Monitor the use of server resources and optimize concurrent processing capabilities.
The website runs slowly on IIS, and usually it is either the server configuration is in place or the details are not paid attention to. If you have eliminated the bandwidth and code itself, the following directions are worth checking.
Check application pool settings
If the IIS application pool is not configured properly, it will directly affect performance. For example, if the recycling frequency is too high and the idle timeout is too short, it will cause the application to be reloaded every request, slowing down the response speed.
- Recycling time : By default, it is recycled once every day at 1 a.m., which is acceptable; but if unplanned recycling is frequently triggered (such as memory or request limit), problems will occur.
- Start Mode : Make sure to set
AlwaysRunningto avoid slow loading during the first access. - Preload Enabled : Turn on "Preload Enabled" in the site's advanced settings to prepare the application in advance.
If you are using ASP.NET, it is recommended to enable "rapidFailProtection" at the same time to prevent the experience from being affected by frequent crashes.
View logs and error requests
Many performance problems actually come from improper handling of certain specific requests or errors. For example:
- The external API was called in the page but the timeout was not set
- Static resource 404 occurs frequently
- Database connection not released or querying inefficiently
You can locate it in the following ways:
- Open IIS log (W3C format) to see if there are a lot of 5xx errors or long requests
- Use the Failed Request Tracing function to track the execution process of specific pages and see which step you can get stuck
- If it is an ASP.NET project, check whether there is an exception stack in the Windows Event Viewer
A common situation is that a page loads a slow SQL query, and the entire application is slowed down. In this case, SQL is required or cache is added.
Adjust IIS module and compression settings
Some IIS modules enabled by default are actually not necessary, but will affect performance. For example, there are too many rules for URL rewriting and dynamic content compression is not enabled.
Recommended operations:
- Disable unnecessary modules such as
CustomErrorModuleandDirectoryListingModule - Enable Dynamic Content Compression
- Set up appropriate HTTP cache headers, especially static resources (JS/CSS/pictures)
Compression is easily ignored. If GZIP or Brotli is not enabled, the web page transmission volume may be several times larger, especially for mobile users.
Server resources and concurrency bottlenecks
Although it seems to be an IIS problem, it is often because the overall load of the server is too high. For example, full CPU load, insufficient memory, and high disk IO will slow down IIS response.
You can observe via Task Manager or Performance Monitor (PerfMon):
- Is the current number of requests very high?
- Does the application pool consumes abnormally?
- Are there databases or other services competing for resources?
If it is the pressure caused by multiple concurrent accesses, you can consider:
- Increase the number of application pools (multi-instance deployment)
- Using load balancing multiple servers
- Optimize the front-end resource loading method (merge JS, lazy loading pictures)
Basically these directions. Some issues are not complicated, but are easily overlooked. Slowly investigate and you will always find the root cause.
The above is the detailed content of Troubleshooting Slow Website Performance Issues on IIS. For more information, please follow other related articles on the PHP Chinese website!
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