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There could be several reasons why Postman desktop application is running slowly on Windows 10:

1. Outdated hardware: If your computer hardware is outdated or not powerful enough, it may not be able to handle Postman's resource-intensive activities, resulting in slow performance.

2. Lack of memory (RAM): Postman requires a significant amount of RAM to run smoothly. If your system has insufficient RAM, Postman may run slowly or crash frequently.

3. Network connectivity issues: If you have connectivity issues with your network or Postman's servers, the software may take longer to complete requests, resulting in delayed response times.

4. Other running processes: If you have several processes running in the background, they may be competing with Postman for system resources, leading to slow performance.

5. Software conflicts: Postman may conflict with other software running on your system, which can cause it to run slowly or crash.

To fix these issues, try upgrading your hardware or adding more memory to your system. Close unnecessary applications and ensure that your internet connection is stable. Additionally, check for software conflicts by disabling background processes and troubleshooting other applications. You can also try optimizing Postman for your system by tweaking the settings and reducing resource usage with a tool like Task Manager.