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With over 2.7 billion monthly active users, Facebook is one of the most widely used social media platforms in the world. However, not all users have access to high-end smartphones or fast internet connections, making it challenging for them to use the full Facebook app. To address this issue, Facebook introduced FB Lite, a lightweight version of the app designed for low-end devices and slow internet connections. In this paper, we present a case study on optimizing mobile app performance using FB Lite's login feature as a prime example. We discuss the design and implementation of FB Lite, the challenges faced during development, and the performance optimization techniques used to ensure a seamless user experience. fb lite login