mozilla/gecko-dev
Jun 2025 – Jun 2025
1 Month active
Languages Used
C++Objective-C++
Technical Skills
C++ debuggingC++C++ DevelopmentDebuggingGraphics
Jeff Muizelaar
PROFILE
Jeff Muizelaar
In June 2025, Jeff Muizelaar enhanced performance profiling in the mozilla/gecko-dev repository by developing two new features focused on main-thread analysis. He implemented main thread profiling markers to measure execution time for CATransaction handling and window painting, providing detailed visibility into UI and graphics operations. Additionally, Jeff introduced stack-based profiling markers, integrating TextStackMarker and StackMarker into profiling macros for granular, stack-aware data collection. Using C++ and Objective-C++, he enabled more precise timing and root-cause analysis, supporting targeted optimization of rendering workloads. The work demonstrated depth in system programming and performance profiling, addressing complex performance analysis requirements for Mozilla’s codebase.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
4Total
Bugs
0
Commits
4
Features
2
Lines of code
147
Activity Months1
Your Network
852 people
Work History
June 2025
4 Commits • 2 Features
Jun 1, 2025June 2025 performance engineering: Implemented enhanced profiling capabilities in mozilla/gecko-dev to improve main-thread performance visibility and guide optimization efforts. Delivered two profiling features: main thread profiling markers for handling main thread CATransaction and window painting/graphics tasks, and stack-based profiling markers (TextStackMarker and StackMarker) with profiling macros for granular, stack-aware data. These changes provide precise timing, enable faster root-cause analysis, and support targeted optimizations of UI/rendering workloads. All work tracked under Bug 1972107 and Bug 1972109 with commits bf9cebccdd3384241c2ab12d2f77aed6d29ff1e1, 1e6a001d347ddad4cce410ae80026ac4dc17a715, c3f6f1f5c0266e26656436cda1c9af43065c1914, and 81e683ee1608fd8500139a60e6d35efc2e317e21.
4 Commits • 2 Features
Jun 1, 2025June 2025 performance engineering: Implemented enhanced profiling capabilities in mozilla/gecko-dev to improve main-thread performance visibility and guide optimization efforts. Delivered two profiling features: main thread profiling markers for handling main thread CATransaction and window painting/graphics tasks, and stack-based profiling markers (TextStackMarker and StackMarker) with profiling macros for granular, stack-aware data. These changes provide precise timing, enable faster root-cause analysis, and support targeted optimizations of UI/rendering workloads. All work tracked under Bug 1972107 and Bug 1972109 with commits bf9cebccdd3384241c2ab12d2f77aed6d29ff1e1, 1e6a001d347ddad4cce410ae80026ac4dc17a715, c3f6f1f5c0266e26656436cda1c9af43065c1914, and 81e683ee1608fd8500139a60e6d35efc2e317e21.
June 2025
Activity
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Quality Metrics
Correctness90.0%
Maintainability90.0%
Architecture85.0%
Performance80.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++Objective-C++
Technical Skills
C++ debuggingC++C++ DevelopmentDebuggingGraphicsPerformance ProfilingSystem Programmingprofiling
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