CRUD List page is slow when using filters

[tiagop93]

Hello, I've recently implemented filters on my CRUD controller, when I try to load the CRUD list view it slowly loads all the items and the pagination loads the items slowly too.
I searched for the problem and I found an issue about 'Slow perfomance in big tables', saying it could be fixed by implementing $this->crud->enableAjaxTable(); in my Entity Crud Controller. The problem is I already implemented that and it doesn't seem to help.

Here's the filter implementation code:
$this->crud->addFilter([ 'name' => 'country', 'type' => 'select2', 'label' => 'Country' ], function() { return News_Posts::all()->pluck('country', 'country')->toArray(); } , function ($value) { $this->crud->addClause('where', 'country', $value); });

PS: I'm using Laravel version 5.3.30; Backpack-crud version 3.2.3
Any suggestions and tips is highly appreciated!

[tiagop93]

Ok, found a way to fix it, the problem was in the filter implementation code. I changed from return News_Posts::all()->pluck('country', 'country')->toArray(); to return News_Posts::pluck('country','country')->toArray();