Optimization of site
There are a number of optimization robots.
The first task is to optimize the DOM https://imgur.com/2UkKQQJ
Now the jQuery plugin Select2 is used to file down lists.
On the main page in the form of exchange these 2 selects work, and upload an instantly sufficiently large amount of data.
I read that in similar situations it is proposed to connect Ajax, or to limit the number of items that are displayed simultaneously in the list, or cache item, etc.
Which way can you decide?
How much will it take for time and value?
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628 28 0 1 Good day !
In any case, the falling list should not contain a huge call-in elements to choose, even through Ajax - it's not user friendly. In such cases, a text field with a falling list of suggestions is made. Let’s look at the site.
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