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Pooling PBOs and textures?
std::shared_ptr<pbo> create_pbo(int size, bool write)
{
    auto pool = pbo_pools[write][size];
    std::shared_ptr<pbo> buffer;
    if(!pool->try_pop(buffer))
        buffer = ogl_thread_.invoke([=]{return new pbo(size, write);});

    return spl::shared_ptr<pbo>(buffer.get(), [=](pbo*) mutable
    {
        ogl_thread_.begin_invoke([=]() mutable
        {
            if(write)
                buffer->map();
            else // read
                buffer->unmap();

            pool->push(buffer);
        });
    });
}