unoptimized msaa resolve

I'm getting this message in Instruments. Does anyone know what that means?

This is the code I'm using:

- (void)drawViewVSync:(id)sender
{
    if (m_initialized)
    {
        if (m_multiSampling)
            glBindFramebuffer(GL_FRAMEBUFFER, m_msaaFramebuffer);
        else
            glBindFramebuffer(GL_FRAMEBUFFER, m_viewFramebuffer);
           
        m_pGame->Render();
       
        if (m_multiSampling)
        {
            glBindFramebuffer(GL_READ_FRAMEBUFFER_APPLE, m_msaaFramebuffer);
            glBindFramebuffer(GL_DRAW_FRAMEBUFFER_APPLE, m_viewFramebuffer);
            glResolveMultisampleFramebufferAPPLE();
            const GLenum attachments[] = {GL_DEPTH_ATTACHMENT, GL_COLOR_ATTACHMENT0};
            glDiscardFramebufferEXT(GL_READ_FRAMEBUFFER_APPLE, 2, attachments);
        }
        else
        {
            const GLenum discards[]  = {GL_DEPTH_ATTACHMENT};
            glDiscardFramebufferEXT(GL_FRAMEBUFFER,1,discards);      
        }
        glBindRenderbuffer(GL_RENDERBUFFER, m_viewRenderbuffer);
        [m_context presentRenderbuffer:GL_RENDERBUFFER];
    }
}