# Tinder Reduces App Cold Starts by 47% with New R8 Configuration Analyzer Tinder enhances mobile app performance to improve user experience. - **Source:** [Android Developers Blog](https://brifing.si/source/ff016576-5a92-405e-aa5a-2a07e0fb093f) - **Published:** 2026-08-18 - **Topic:** [Software & Engineering](https://brifing.si/c/engineering) - **Original article:** - **On Brifing:** https://brifing.si/s/96826486-2cf3-4673-9f30-cf38e001ccfb ## Tinder's Mobile App Optimization Tinder noticed that as its Android app's codebase grew, so did its complexity. Approximately 70% of the app was unoptimized, containing 17 dex files. This situation prolonged app startup times and caused users to encounter 'Application Not Responding' (ANR) errors. Tinder decided to use the new R8 Configuration Analyzer to address these issues. ## The Role of the R8 Configuration Analyzer The R8 Configuration Analyzer tracks shrinking, optimization, and obfuscation scores to highlight areas for improvement. This tool identifies broad, redundant, or obsolete keep rules and allows analysis of their impact on optimization. Tinder used this tool to identify and remove optimization-blocking rules, achieving significant improvements. ## Identifying Optimization Blockers Using the R8 Configuration Analyzer, Tinder discovered that only 28% of its codebase was optimized. During the analysis, it was revealed that an internal library had introduced a broad keep rule. This rule was preventing optimization across a large portion of the app. The team narrowed this rule to unlock optimization potential. ## Performance Improvements Tinder reduced app cold start times by 47% using the R8 Configuration Analyzer. The app download size was reduced by 28.98% to 61.5 MB. Additionally, user-perceived ANR errors decreased by 28%. These improvements significantly enhanced the app's overall performance. ## Reducing Technical Debt Tinder successfully reduced its technical debt with the R8 Configuration Analyzer. The number of DEX files was reduced from 17 to 11, with only two startup files remaining. These changes decreased the app's complexity, enabling faster and more stable operation. ## Enhancements in User Experience Optimization efforts significantly improved the user experience. Engagement increased, especially in regions with a high prevalence of low-RAM devices. Reducing ANR errors encouraged users to use the app more frequently in these markets. ## Impact on Business Growth App optimization contributed to Tinder's business growth. User engagement increased by 3% following optimization. This growth was particularly noticeable in resource-constrained markets. Tinder continues its optimization efforts to sustain this success. ## Future Goals Tinder aims to further advance mobile app optimization. The team plans to use the R8 Configuration Analyzer to increase optimization scores above 50%. This goal will enhance app performance, ensuring users enjoy a smoother experience. ## Sources covering this story - http://android-developers.googleblog.com/2026/08/tinder-app-cold-start-r8-configuration-analyzer.html — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._