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glean
An open source benchmarking tool used to measure and compare the underlying hardware of OpenGL implementations. (MIT/X Consortium License)
High Performance OpenGL on nVidia GPUs under Linux
Review of OpenGL features and extensions, also performance comparisons between them and concluding remarks on application design based upon the results.
NVShaderPerf
Command line utility that reports shader performance metrics. DirectX and OpenGL shaders written in HLSL for NVIDIA GeForce FX GPU
OpenGL Performance Benchmarking
Overview at www.opengl.org
OpenGL Performance Tips
For optimising application performance.
SPECopc Group
Develops Benchmarks for Systems Based on the OpenGL API.