Annotated GL Trace, single sprite Unity 5.3.3f1 OpenGLCore

    0.04 µs glPushGroupMarkerEXT(0, "Camera.ImageEffects");
    0.03 µs glPopGroupMarkerEXT(); returns: "Camera.ImageEffects" 
    0.03 µs glPushGroupMarkerEXT(0, "Camera.GUILayer");
    0.02 µs glPopGroupMarkerEXT(); returns: "Camera.GUILayer" 
    0.02 µs glPopGroupMarkerEXT(); returns: "Camera.Render" 
    0.03 µs glPushGroupMarkerEXT(0, "GUI.Repaint");
    0.03 µs glPopGroupMarkerEXT(); returns: "GUI.Repaint" 
    0.38 µs glBindBuffer(GL_COPY_WRITE_BUFFER, 2);
******************************************************************************************
* Buffers 2 and 3 are used in the next few lines:
******************************************************************************************
    0.26 µs glMapBufferRange(GL_COPY_WRITE_BUFFER, 0x00001548, 0x00000060, GL_MAP_WRITE_BIT | GL_MAP_FLUSH_EXPLICIT_BIT | GL_MAP_UNSYNCHRONIZED_BIT); returns: 0x16a83548 
    0.08 µs glBindBuffer(GL_COPY_WRITE_BUFFER, 3);
    0.05 µs glMapBufferRange(GL_COPY_WRITE_BUFFER, 0x00000750, 0x0000000c, GL_MAP_WRITE_BIT | GL_MAP_FLUSH_EXPLICIT_BIT | GL_MAP_UNSYNCHRONIZED_BIT); returns: 0x16b82750 
    0.05 µs glBindBuffer(GL_COPY_WRITE_BUFFER, 2);
    0.96 µs glFlushMappedBufferRange(GL_COPY_WRITE_BUFFER, 0x00000000, 0x00000060);
    0.10 µs glUnmapBuffer(GL_COPY_WRITE_BUFFER); returns: GL_TRUE 
    0.06 µs glBindBuffer(GL_COPY_WRITE_BUFFER, 3);
    0.24 µs glFlushMappedBufferRange(GL_COPY_WRITE_BUFFER, 0x00000000, 0x0000000c);
    0.02 µs glUnmapBuffer(GL_COPY_WRITE_BUFFER); returns: GL_TRUE 
    5.91 µs glUseProgram(87);
    0.21 µs glBindTexture(GL_TEXTURE_2D, 22);
    0.40 µs glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    0.17 µs glDepthFunc(GL_ALWAYS);
    0.76 µs glUniformMatrix4fv(2, 1, 0, {0.00195312, 0, 0, 0, 0, 0.00260417, 0, 0, 0, 0, -0.019802, 0, -1, -1, -0.980198, 1});
   15.23 µs glDrawElementsBaseVertex(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0x00000750, 227);
    0.04 µs glPushGroupMarkerEXT(0, "PlayerEndOfFrame");
    0.04 µs glPopGroupMarkerEXT(); returns: "PlayerEndOfFrame" 
******************************************************************************************
* This frame ends....
******************************************************************************************
  169.34 µs CGLFlushDrawable();
    0.05 µs glPushGroupMarkerEXT(0, "ReflectionProbes.Update");
    0.04 µs glPopGroupMarkerEXT(); returns: "ReflectionProbes.Update" 
    0.06 µs glPushGroupMarkerEXT(0, "Camera.Render");
    0.04 µs glPushGroupMarkerEXT(0, "Drawing");
    0.03 µs glPushGroupMarkerEXT(0, "Render.OpaqueGeometry");
    0.03 µs glPushGroupMarkerEXT(0, "RenderForwardOpaque.Render");
    0.03 µs glPushGroupMarkerEXT(0, "Clear");
    1.54 µs glEnable(GL_SCISSOR_TEST);
    0.23 µs glDepthMask(GL_TRUE);
    0.33 µs glClearColor(0.192157, 0.301961, 0.47451, 0.0196078);
    0.32 µs glClearDepthf(1);
    0.15 µs glClearStencil(0);
   13.07 µs glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
    0.30 µs glDisable(GL_SCISSOR_TEST);
    0.04 µs glPopGroupMarkerEXT(); returns: "Clear" 
    0.03 µs glPopGroupMarkerEXT(); returns: "RenderForwardOpaque.Render" 
    0.02 µs glPopGroupMarkerEXT(); returns: "Render.OpaqueGeometry" 
    0.03 µs glPushGroupMarkerEXT(0, "Camera.ImageEffects");
    0.01 µs glPopGroupMarkerEXT(); returns: "Camera.ImageEffects" 
    0.02 µs glPushGroupMarkerEXT(0, "Render.TransparentGeometry");
    0.02 µs glPushGroupMarkerEXT(0, "RenderForwardAlpha.Render");
    3.01 µs glUseProgram(6);
    0.70 µs glBindTexture(GL_TEXTURE_2D, 2);
    0.20 µs glBlendFuncSeparate(GL_ONE, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
    0.08 µs glDepthFunc(GL_LEQUAL);
    0.06 µs glDepthMask(GL_FALSE);
******************************************************************************************
* The same buffers, (2 and 3) are remapped synchronously- without being discarded or ensuring exclusive access by the CPU.
* The first one takes a REALLY long time. This is definitely a worst case situation
* for the single sprite replication project we sent, but similarly high (or higher) 
* times can be found on real projects in the same manner.
******************************************************************************************
    0.41 µs glBindBuffer(GL_COPY_WRITE_BUFFER, 2);
29731.12 µs glMapBufferRange(GL_COPY_WRITE_BUFFER, 0x00000000, 0x00001548, GL_MAP_WRITE_BIT | GL_MAP_FLUSH_EXPLICIT_BIT); returns: 0x16a82000 
    2.28 µs glBindBuffer(GL_COPY_WRITE_BUFFER, 3);
    4.18 µs glMapBufferRange(GL_COPY_WRITE_BUFFER, 0x00000000, 0x0000073e, GL_MAP_WRITE_BIT | GL_MAP_FLUSH_EXPLICIT_BIT); returns: 0x16b82000 
    0.24 µs glBindBuffer(GL_COPY_WRITE_BUFFER, 2);
    6.26 µs glFlushMappedBufferRange(GL_COPY_WRITE_BUFFER, 0x00000000, 0x00001548);
    0.45 µs glUnmapBuffer(GL_COPY_WRITE_BUFFER); returns: GL_TRUE 
    0.11 µs glBindBuffer(GL_COPY_WRITE_BUFFER, 3);
    1.49 µs glFlushMappedBufferRange(GL_COPY_WRITE_BUFFER, 0x00000000, 0x0000073e);
    0.05 µs glUnmapBuffer(GL_COPY_WRITE_BUFFER); returns: GL_TRUE 
    1.00 µs glBindTexture(GL_TEXTURE_2D, 18);
    2.66 µs glUniformMatrix4fv(2, 1, 0, {0.15, 0, 0, 0, 0, 0.2, 0, 0, 0, 0, 0.0020006, 0, -0.358024, -0.2, -0.980594, 1});
   89.01 µs glDrawElements(GL_TRIANGLES, 927, GL_UNSIGNED_SHORT, 0x00000000);
    0.22 µs glPopGroupMarkerEXT(); returns: "RenderForwardAlpha.Render" 
    0.03 µs glPopGroupMarkerEXT(); returns: "Render.TransparentGeometry" 
    0.03 µs glPopGroupMarkerEXT(); returns: "Drawing" 
    0.05 µs glPushGroupMarkerEXT(0, "Camera.ImageEffects");
    0.03 µs glPopGroupMarkerEXT(); returns: "Camera.ImageEffects" 
    0.03 µs glPushGroupMarkerEXT(0, "Camera.GUILayer");
    0.03 µs glPopGroupMarkerEXT(); returns: "Camera.GUILayer" 
    0.03 µs glPopGroupMarkerEXT(); returns: "Camera.Render" 
    0.04 µs glPushGroupMarkerEXT(0, "GUI.Repaint");
    0.03 µs glPopGroupMarkerEXT(); returns: "GUI.Repaint" 
    0.52 µs glBindBuffer(GL_COPY_WRITE_BUFFER, 2);
    0.42 µs glMapBufferRange(GL_COPY_WRITE_BUFFER, 0x00001548, 0x00000060, GL_MAP_WRITE_BIT | GL_MAP_FLUSH_EXPLICIT_BIT | GL_MAP_UNSYNCHRONIZED_BIT); returns: 0x16a83548 
    0.10 µs glBindBuffer(GL_COPY_WRITE_BUFFER, 3);
    0.09 µs glMapBufferRange(GL_COPY_WRITE_BUFFER, 0x00000750, 0x0000000c, GL_MAP_WRITE_BIT | GL_MAP_FLUSH_EXPLICIT_BIT | GL_MAP_UNSYNCHRONIZED_BIT); returns: 0x16b82750 
    0.07 µs glBindBuffer(GL_COPY_WRITE_BUFFER, 2);
    1.54 µs glFlushMappedBufferRange(GL_COPY_WRITE_BUFFER, 0x00000000, 0x00000060);
    0.14 µs glUnmapBuffer(GL_COPY_WRITE_BUFFER); returns: GL_TRUE 
    0.09 µs glBindBuffer(GL_COPY_WRITE_BUFFER, 3);
    0.28 µs glFlushMappedBufferRange(GL_COPY_WRITE_BUFFER, 0x00000000, 0x0000000c);
    0.05 µs glUnmapBuffer(GL_COPY_WRITE_BUFFER); returns: GL_TRUE 
    6.17 µs glUseProgram(87);
    0.28 µs glBindTexture(GL_TEXTURE_2D, 22);
    0.49 µs glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    0.45 µs glDepthFunc(GL_ALWAYS);
    0.84 µs glUniformMatrix4fv(2, 1, 0, {0.00195312, 0, 0, 0, 0, 0.00260417, 0, 0, 0, 0, -0.019802, 0, -1, -1, -0.980198, 1});
   19.34 µs glDrawElementsBaseVertex(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0x00000750, 227);
******************************************************************************************
* End of second frame.
******************************************************************************************
    0.06 µs glPushGroupMarkerEXT(0, "PlayerEndOfFrame");
    0.05 µs glPopGroupMarkerEXT(); returns: "PlayerEndOfFrame" 
  222.50 µs CGLFlushDrawable();