Web - speedup page load

[DJTommek]

If some location page is opened, everything is loaded first and then rendered. This cause significant TTFB, before external data are loaded.

External data = data that can't be calculated but needs to be requested from another server, such as:

• Timezone (local time, daylight saving time, UTC offset)
• AMSL (above mean sea level)
• Address
• What3Word

Solution

• Could be solved by loading it separately as AJAX request, once page is loaded
• external data should be cached (I think it is already cached)

Implementation notes:

• there should be query parameters, that would force load these data directly (useful if output is JSON or XML)
• if data was previously already loaded, no need to request it via AJAX later, just render it directly. Only if it is not too much trouble to implement 🙂

TODO

• [x] Address
• [ ] Timezone data
• [ ] Elevation
• [ ] Third party services
  • [ ] What3Words
  • [ ] Google Maps Street View
  • [ ] Mapy.cz Panorama

[DJTommek]

All mentioned external data endpoints are really fast except gathering elevation info (AMSL) which is timeouting (5 seconds). So currently solved via disabling it by default (see commit 8161e9c73b9c248304327668bd5468a16590d71e), but can be manually enabled by adding GET parameter elevation=true, for example:

• https://better-location.palider.cz/50.087451,14.420671?elevation=true