Slow loading large locations lists

[pettazz]

Now that the location list is pretty large, the fact that we do 3 separate full loops (map(), filter(), sort()) to merge, then filter, then sort is noticeably slow, so they should be combined to reduce as much as possible.

[pettazz]

nvm, looks like the filtering and sorting is milliseconds quick, it's alpines generating the template and adding it to the DOM that takes a few seconds. Not sure there's anything we can do to improve this, but there may be performance tweaks to help alpine.