Mesa 19.1 has added support for the GLX extension to create an OpenGL / OpenGL ES context that doesn’t generate errors — assuming the driver supports the likes of KHR_no_error. For applications/games acquiring their GL/GLES context in this no-error mode, it can yield possible performance benefits…

Source: Phoronix – GLX_ARB_create_context_no_error Support Lands In Mesa 19.1