Remove 3 minor causes of render delay

* Change 3 cases of `render` to `renderLive`
* Add `{{#if expanded}}` block in `responses/tree.mustache`
* Don't render `reference_url` section unless `reference_url` is
  actually set (the delay here is actually the `render` call)
Stop estimating and just measure modelization delay
Merge pull request #1115 from reciprocity/feature/minor-lag-removal

Minor lag removal