When it comes to enhancing your Rails web app development, utilizing the right frameworks can make a significant difference. Here are the Top 5 Frameworks that can elevate your development process:

1. Bootstrap: This front-end framework is essential for creating responsive and mobile-first applications quickly. With pre-designed components and responsive grid systems, Bootstrap allows developers to build aesthetically pleasing and highly functional user interfaces.
2. Devise: For managing user authentication, Devise is an invaluable Ruby on Rails gem. It provides a comprehensive solution to handle user registrations, logins, and password recoveries, ensuring security is a top priority.

3. RSpec: This automated testing framework helps ensure that your application runs smoothly. RSpec allows you to write tests in a readable format, making it easier for you to identify issues early in the development process.
4. Pundit: For managing your application’s authorization, Pundit offers a simple and robust solution. With its policy-based approach, you can easily manage user permissions and ensure that sensitive actions are protected appropriately.
5. Sidekiq: To manage background jobs efficiently, Sidekiq is crucial for enhancing your Rails application's performance. It allows you to process data asynchronously, improving the overall user experience by handling resource-intensive tasks in the background.

By incorporating these frameworks into your Rails development workflow, you can streamline processes, enhance security, and improve user experience, ultimately resulting in a more robust web application.

To optimize your Rails app for better performance, it’s essential to start with profiling your application. This helps you identify bottlenecks in your code and database queries. You can use tools like rack-mini-profiler or New Relic to monitor the performance of your application in real-time. Once you've pinpointed the areas that need improvement, consider implementing caching mechanisms such as fragment caching or low-level caching to reduce the load on your server and speed up response times.

Another critical aspect of optimizing a Rails app is ensuring that your database queries are efficient. Use ActiveRecord query methods wisely to avoid N+1 query problems, and consider indexing your database columns appropriately. Additionally, minimizing the use of complex queries and employing background jobs for processes that don’t need to be executed in real-time can free up resources. By following these strategies, you can significantly enhance the performance of your Rails application.

Building your first Rails application can be an exciting experience, but it often comes with a steep learning curve. One of the most common mistakes that new developers make is neglecting proper planning before diving into coding. This can lead to a chaotic structure and difficulty in maintaining the application. To avoid this, take the time to outline the application's architecture, including the models, views, and controllers. A well-thought-out plan will save you time and frustration in the long run.

Another frequent blunder is underestimating the importance of version control. Many beginners skip setting up a version control system like Git, thinking they can manage without it. However, not utilizing version control can lead to lost progress, confusion over code changes, and difficulties in collaboration. Make it a habit to regularly commit your changes and create branches for new features to keep your code organized and secure.