Too much time for a database import

Hello,

we know that having a remote host, a local import with mysql is faster than phpmyadmin because there is no time to upload the database, but I noticed something strange and I made the following tests:

1. Import a 90MB database locally (after send it via scp) via mysql:
   mysql -u root -pPASS DB_NAME < /tmp/DUMP.sql
   it takes 1m46s

2. Import a 90MB database remotely via mysql:
   mysql -u root -pPASS -h REMOTE_HOST DB_NAME < /tmp/DUMP.sql
   it takes 1m50s

3. Import a 90MB database remotely via phpmyadmin:
   it takes 12m

I guess there is something bad but I don't know where.

I'm using Gentoo as OS, I have nginx+php fpm, following some useful data from php.ini:
max_execution_time = 8000
upload_max_filesize = 2048M
memory_limit = 1024M
post_max_size = 4096M

From php-fpm.conf I have:
php_admin_value[memory_limit] = 1024M

Server configuration

Operating system:
Gentoo Linux

Web server:
Nginx

Database:
Mariadb-10.1.29

PHP version:
5.6.33

phpMyAdmin version:
4.8.1

Client configuration

Browser:
Chromium-67.0.3396.62

Operating system:
Gentoo Linux

Start by reproducing the three 90MB import timings using the reported Gentoo, Nginx, PHP-FPM, MariaDB, PHP, and phpMyAdmin versions and configuration. Compare the phpMyAdmin import path with the direct mysql commands to isolate the bottleneck. Done means identifying a reproducible cause and documenting or fixing the slower behavior.