Prestashop 1.5 - 从另一个prestashop 1.4安装中导入大量数据（类别，产品，客户，地址），

i have prestashop 1.5 installed on server A, on server B there is prestashop 1.4 installed with thousands of products and database size is about 500mb. I want to import all those products, categories, customers and their addresses from 1.4 installation to 1.5 installation. I have access to both servers. CSV export for products is taking like forever what should i do to import this all to 1.5.i have prestashop 1.5 installed on server A, on