Faceted search mysql (EAV). How to increase speed of facet counting? - mysql

Question

I make faceted search using mysql and it was good on test data. Then I upload 7000 of items and 20000 of filter-item relations. Now some queries to count items amount for each filters takes much time.
Each category has own filters. Each filter has own filter values (filter_v_id).
For simplicity, I will show two tables:
CREATE TABLE `item_cat` (
`item_id` int(11) NOT NULL,
`category_id` int(11) NOT NULL,
`publicate` int(1) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
ALTER TABLE `item_cat`
ADD PRIMARY KEY (`item_id`,`category_id`),
ADD KEY `item_id` (`item_id`),
ADD KEY `category_id` (`category_id`);
CREATE TABLE `filter_item` (
`item_id` int(11) NOT NULL,
`filter_id` int(11) NOT NULL,
`filter_v_id` int(11) NOT NULL,
`filter_v` decimal(10,2) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
ALTER TABLE `filter_item`
ADD PRIMARY KEY (`item_id`,`filter_id`,`filter_v_id`),
ADD KEY `item_id` (`item_id`),
ADD KEY `item_id_2` (`item_id`,`filter_id`),
ADD KEY `item_id_3` (`item_id`,`filter_id`,`filter_v_id`),
ADD KEY `filter_id` (`filter_id`,`filter_v_id`),
ADD KEY `filter_id_2` (`filter_id`);
DB Fiddle - fast query
Category_id=70 has 46 items, and any set of filters fast (100-150ms)
SELECT `filter_id`,`filter_v_id`, count(`item_id`) as `cnt` FROM
(SELECT * FROM `item_cat` WHERE `category_id`='70') as `ic`
JOIN `filter_item` as `fi` USING(`item_id`)
WHERE `item_id` IN(
SELECT `ic`.`item_id` FROM
(SELECT * FROM `item_cat` WHERE `category_id`='70') as `ic`
JOIN `filter_item` as `fi` USING(`item_id`)
GROUP BY `ic`.`item_id`
HAVING (
(`fi`.`filter_id` = '1' OR MAX(`fi`.`filter_v_id` = '932')=1 OR MAX(`fi`.`filter_v_id` = '938')=1 OR MAX(`fi`.`filter_v_id` = '1006')=1 )
AND (`fi`.`filter_id` = '17' OR MAX(`fi`.`filter_v_id` = '563')=1 )
AND (`fi`.`filter_id` = '28' OR MAX(`fi`.`filter_v` >= '2' AND `fi`.`filter_v` <= '22500')=1)
AND (`fi`.`filter_id` = '46' OR MAX(`fi`.`filter_v_id` = '580')=1 OR MAX(`fi`.`filter_v_id` = '595')=1 OR MAX(`fi`.`filter_v_id` = '559')=1 )
AND (`fi`.`filter_id` = '70' OR MAX(`fi`.`filter_v_id` = '564')=1 )
AND (`fi`.`filter_id` = '73' OR MAX(`fi`.`filter_v_id` = '562')=1 )
AND (`fi`.`filter_id` = '74' OR MAX(`fi`.`filter_v_id` = '561')=1 )
)
)
GROUP BY `filter_id`,`filter_v_id`
DB Fiddle - slow query
Category_id=52 has 651 items, and one applied filter took 3000ms+
SELECT `filter_id`,`filter_v_id`, count(`item_id`) as `cnt` FROM
(SELECT * FROM `item_cat` WHERE `category_id`='52') as `ic`
JOIN `filter_item` as `fi` USING(`item_id`)
WHERE `item_id` IN(
SELECT `item_id` FROM
(SELECT * FROM `item_cat` WHERE `category_id`='52') as `ic`
JOIN `filter_item` as `fi` USING(`item_id`)
GROUP BY `ic`.`item_id`
HAVING (
(`fi`.`filter_id` = '47' OR MAX(`fi`.`filter_v_id` = '474')=1 )
)
)
GROUP BY `filter_id`,`filter_v_id`
Please tell me how to increase the speed of query?