Laravel重载mysql数据库

I updated my laravel 4.2 project to 5.5, and swited the php 5.6 version to 7.2. When I try to switch my production server to the new one, with the exact same configurations (values, php fpm and nginx), my MYSQL 5.6 database (with 16 processors) starts to overloading and executing some about 200+ threads per time (the old executes arround 16 threads), knocking down my server after some minutes. Has anyone ever had this problem? Or know how to handle it?

I didn't find the exactly answer to these problemns and why laravel 5.5 is overloading the mysql database and the 4.2 don't. But I found a cache lib of eloquent models in Laravel that give a high performance result using one redis database.

The lib in question is: github.com/GeneaLabs/laravel-model-caching

It promises a huge performance improvement.