The app relied on complex, often redundant frameworks. For instance, it maintained 40 different versions of a contact list
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The primary shift in Messenger's development occurred around 2020, focusing on a complete "ground-up" rebuild. Feature New Versions (Post-2020) Code Base Over 1.7 million lines of code Reduced to ~ 360,000 lines (84% reduction) App Size Large, often considered "bloated" Roughly 1/4 the size of previous versions Performance Slower launch times due to complexity Up to 2x faster launch speeds Focus Feature-rich (GIFs, mini-apps, complex UI) Simplified interface and core speed Downloading Older Messenger IPAs The app relied on complex, often redundant frameworks