Concise monthly summary for 2026-04 focused on the 86Box/86Box project, highlighting key features delivered, major bugs fixed, and overall impact. This month emphasized JIT reliability and performance, cross-architecture correctness, and input responsiveness in the SDL event loop. Key contributions include: - JIT Code Generation and Runtime Stability Improvements: improvements to JIT code generation including wrappers for function calls, more stable code layout, and alignment fixes in the JIT load path to improve reliability and performance. - ARM64 Code Generation Correctness: MOV truncation paths added to handle differing destination/source sizes and correct bit-field insertion, improving codegen correctness. - Input Handling Performance Optimization: optimization of input event handling by reducing polling overhead to improve responsiveness of the SDL event loop. Impact and outcomes: - More deterministic JIT code layouts and reduced risk of regressions in hot paths due to deterministic eviction strategy. - Cross-architecture correctness improvements, especially on ARM64, reducing platform-specific bugs. - Faster and more responsive user experience due to SDL input polling optimizations. Technologies/skills demonstrated: - JIT codegen design and stability tuning, Linux x86-64 ABI considerations, ARM64 codegen paths, and SDL event loop optimization.