Codeigniter 3 is too slow

Hello,
Try to use memcached instead of redis
apt install memcached
apt install php7.0-memcached (change 7.0 with your php version)
then go to /application/config/config.php and chage this lines
$config['sess_driver'] = 'redis';
$config['sess_save_path'] = 'localhost';
with this
$config['sess_driver'] = 'memcached';
$config['sess_save_path'] = 'localhost:11211';

this config work with me