optimize react-native app performance

hi I have my android/ios apps built with React-Native, that is using Magento RESTful API's on back-end. Now, i want to optimize the search and product loading speed for our mobile app in 1-2 seconds. As its taking upto 7 seconds to load search results and products. Most probably, It is fetching data on every request which is making it slow, like that. watch this video for speed performance [login to view URL] RESTful API [login to view URL][requestName]=quick_search_container&searchCriteria[filterGroups][0][filters][0][field]=search_term&searchCriteria[filterGroups][0][filters][0][value]=Acrylic &searchCriteria[filterGroups][0][filters][0][conditionType]=like&searchCriteria[filterGroups][1][filters][0][field]=visibility&searchCriteria[filterGroups][1][filters][0][value]=4&searchCriteria[filterGroups][1][filters][0][conditionType]=eq&searchCriteria[filterGroups][2][filters][0][field]=status&searchCriteria[filterGroups][2][filters][0][value]=1&searchCriteria[filterGroups][2][filters][0][conditionType]=eq&searchCriteria[pageSize]=10&searchCriteria[currentPage]=0&searchCriteria[filterGroups][5][filters][0][field]=website_id&searchCriteria[filterGroups][5][filters][0][value]=1&searchCriteria[filterGroups][5][filters][0][conditionType]=eq Note: i don't want any changes on website or its speed. Its just about optimization for mobile-app.