Comment by mdaniel

> div.innerHTML = xhr.responseText;

Did you test this? Because CORS aside, that sure does look like it will append the whole of page 2 to the body of page 1 and get progressively worse as one reaches the pagination of page 2. It would be more code (and memory pressure) but I believe the correct impl of any such trickery would be to reach into the actual table of page 2 and jam that into the body of page 1