jsForAPI + jQuery = TTFB 500 ms

Hi!

I use `jsForAPI` for jQuery-based AJAX call:

```
apiAJAXCall :: Text
apiAJAXCall = jsForAPI api' jquery
```

where `api'` is an API from one single endpoint. After that I embed this text into ``-tag in the **index page** (it's important detail, see below).

It works perfectly, but I see that the first request is too slow: TTFB is ~500 ms (on `localhost`!). Important: **it's not AJAX-request for this endpoint, it's a request to index page**! Such a big delay occurs only for the first request to the **index page** (after app reload), all other requests are very fast. How can I fix it?