I've tried what was available to me in the past with this. Only options are to either have all embeds load at once or lazy load (load as you scroll to it). If it were only 1 - 2 tweets on a page, I would have everything load up-front, but pages with more than a couple tweets would take a long time to load, where it was a hinderance on the site. From what I know, it's something that I can't optimize any further at this time, but I'm consistently checking for options to improve in this area. If there is something, it will be an instant enable / purchase.