Add analyzer performance page (#7020)

Add Analyzer performance page.

Resolves #6924

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Parker Lougheed <[email protected]>

Author: 3 people

site/lib/src/style_hash.dart

@@ -2,4 +2,4 @@
 // dart format off
 
 /// The generated hash of the `main.css` file.
-const generatedStylesHash = 'yDmRCh8GrQiX';
+const generatedStylesHash = 'X6ZbnMpWSdwu';

src/content/tools/analysis.md

@@ -657,6 +657,7 @@ Use the following resources to learn more about static analysis in Dart:
 * [Dart's type system][type-system]
 * [Dart linter rules][linter rules]
 * [analyzer package]({{site.pub-pkg}}/analyzer)
+* [Troubleshoot analyzer performance][]
 
 [invalid_null_aware_operator]: /tools/diagnostic-messages#invalid_null_aware_operator
 [analyzer diagnostics]: /tools/diagnostic-messages
@@ -671,3 +672,4 @@ Use the following resources to learn more about static analysis in Dart:
 [Effective Dart]: /effective-dart
 [`dart format`]: /tools/dart-format
 [Configuring formatter page width]: /tools/dart-format#configuring-formatter-page-width
+[Troubleshoot analyzer performance]: /tools/analyzer-performance

src/content/tools/analyzer-performance.md

@@ -0,0 +1,112 @@
+---
+title: Troubleshoot analyzer performance
+description: >-
+  Learn how to diagnose and resolve common
+  Dart analysis server performance issues.
+---
+
+This guide helps you diagnose and resolve common Dart analysis server 
+performance issues in your Dart or Flutter IDE.
+
+## Known performance issues
+
+Several common issues significantly hurt the performance of 
+the Dart analysis server (the analyzer).
+Check the following issues to see if they might be impacting 
+your development environment.
+
+### Security software on Windows
+
+On Windows systems, if Windows Defender (or other real-time security software) 
+is enabled, it can slow down the file read times enough 
+to impact analyzer performance. The analyzer frequently reads files, 
+and constant scanning can introduce latency. To mitigate this, 
+you can set up exclusions for the directories the analyzer reads from.
+
+:::warning
+Excluding directories from security scans might diminish the 
+protection that your antivirus software provides.
+Proceed with caution.
+:::
+
+If you choose to set up exclusions, include the following directories:
+
+* The analysis server's cache directory: `%LOCALAPPDATA%\.dartServer`
+* The directory for packages downloaded by pub: `%LOCALAPPDATA%\Pub\Cache`
+* Any other directories containing code for your applications.
+
+For another way to improve file I/O performance, 
+consider setting up a [dev drive][].
+
+### Symbolic links
+
+If your package directory contains symbolic links that point 
+to a location inside the same directory, or to a parent directory, 
+you might experience performance problems with Dart tooling (like the analyzer).
+
+**Status:** The Dart team is actively working on a fix for this issue.
+
+**Workaround:** There are no known workarounds at this time.
+
+## Report unknown issues
+
+If the known issues don't seem to apply to your situation, 
+please open an issue in the [Dart SDK issue tracker][]. 
+The more information you provide,
+the faster the team can diagnose and fix the problem.
+
+### Include reproduction steps
+
+In your issue, please provide detailed steps to
+reproduce the behavior you're observing.
+
+1. If you're working on an open-source project, include instructions 
+  for downloading the code.
+2. If you can't share your code, create a small, self-contained reproduction case.
+3. If you can't provide either, please state that in the issue.
+
+### Provide performance data
+
+If the issue is related to performance, providing performance data 
+can be very helpful. You can collect this data using the 
+analysis server's diagnostic pages:
+
+1. **Open the Analyzer Diagnostics page:**
+    * **If you are using VS Code:**
+        1. Click **View > Command Palette**.
+        2. Type `Dart: Open Analyzer Diagnostics` and select it.
+    * **If you are using IntelliJ / Android Studio:**
+        1. Open the **Dart Analysis** tool window.
+        2. Click the settings icon, and then select **View analyzer diagnostics**.
+2. **Collect the report:**
+    1. In the browser page that opens, click **Collect Report** in the top banner.
+    2. Perform the actions that trigger the slow behavior.
+    3. Click the **Download report** link.
+3. **Attach the report to your issue.**
+
+:::note
+While the report shouldn't contain 
+personal or proprietary information, 
+review it before submitting it.
+:::
+
+### Capture instrumentation logs
+
+In some cases, instrumentation logs can provide additional 
+details for diagnosing issues.
+
+To capture these logs:
+
+* **VS Code:** Follow the instructions for 
+  [capturing analyzer instrumentation logs][].
+* **IntelliJ / Android Studio:** Follow the
+  [analyzer instrumentation instructions][].
+
+Before attaching logs to a GitHub issue, review them carefully
+to ensure they do not contain any personal, sensitive, or proprietary
+information.
+
+[dev drive]: https://learn.microsoft.com/windows/dev-drive/
+[Dart SDK issue tracker]: https://github.com/dart-lang/sdk/issues
+[capturing analyzer instrumentation logs]: https://dartcode.org/docs/logging/#analyzer-instrumentation
+[analyzer instrumentation instructions]: https://github.com/dart-lang/sdk/blob/main/pkg/analysis_server/doc/tutorial/instrumentation.md#intellij-idea-and-android-studio

src/data/sidenav/default.yml

@@ -271,6 +271,8 @@
         permalink: /tools/jetbrains-plugin
       - title: VS Code
         permalink: /tools/vs-code
+      - title: Troubleshoot analyzer performance
+        permalink: /tools/analyzer-performance
       - title: Dart DevTools
         permalink: /tools/dart-devtools
       - title: DartPad