# Profiling Desktop using the Chrome Developer Tools
Sometimes performance issues are hard to identify and recreate. If you notice
a regression and can reproduce it, you can use the Timeline tools in Chrome Dev
Tools to take a snapshot of the application performance and attach it to an
issue.
## Steps
- Launch Desktop and select **View** | **Toggle Developer Tools**.
- Get the Desktop application ready to perform the problem action.
- Select the **Performance** tab. Ensure the **Disable JavaScript samples** option is **unchecked**.
- Press the **Record** button on the left to start recording.
- Perform the problem action in Desktop. Try and keep the test focused on the
issue you're seeing.
- Switch back to the Developer tools and press **Stop** to complete recording.
- In the header, click the **Save profile...** menu item. Save the JSON file
somewhere you can access later.
- Compress the JSON file to reduce the file size (it could be 10MB or more
depending on how long you ran the test for).
- Attach the file to your GitHub issue so the contributors can load this into
their environment and spelunk the diagnostic information.