Slowness using MySQL Router

[Filippo Ciotta]

Hello,
I'm a newbie with MySQL so sorry in advance for any inaccuracy.

I'm setting up a Wordpress website hosted on IIS10/Win2016 with PHP 7.1.11.
On the backend I have a cluster of three nodes running MySLQ 5.7 on Win2016 (one R/W, the other two R/O).

I installed MySQL Router on the IIS node to balance the requests to the cluster but I notice a slowdown of the page loading (about x3 times).

After the post is the mysqlrouter.conf.

Is it normal?
Does anyone noticed a similar behaviour?

Thank you,
Filippo

####################################
#
# mysqlrouter.conf
#
####################################

# File automatically generated during MySQL Router bootstrap
[DEFAULT]
logging_folder=C:/ProgramData/MySQL/MySQL Router/log
runtime_folder=C:/ProgramData/MySQL/MySQL Router/run
data_folder=C:/ProgramData/MySQL/MySQL Router/data
keyring_path=C:/ProgramData/MySQL/MySQL Router/data/keyring
master_key_path=C:/ProgramData/MySQL/MySQL Router/mysqlrouter.key

[logger]
level = INFO

[metadata_cache:MySQLCLU]
router_id=6
bootstrap_server_addresses=mysql://testdb01:3306,mysql://testdb02:3306,mysql://testdb03:3306
user=mysql_router6_egojz3hzu6t6
metadata_cluster=MySQLCLU
ttl=300

[routing:MySQLCLU_default_rw]
bind_address=0.0.0.0
bind_port=6446
destinations=metadata-cache://MySQLCLU/default?role=PRIMARY
mode=read-write
protocol=classic

[routing:MySQLCLU_default_ro]
bind_address=0.0.0.0
bind_port=6447
destinations=metadata-cache://MySQLCLU/default?role=SECONDARY
mode=read-only
protocol=classic

[routing:MySQLCLU_default_x_rw]
bind_address=0.0.0.0
bind_port=6448
destinations=metadata-cache://MySQLCLU/default?role=PRIMARY
mode=read-write
protocol=x

[routing:MySQLCLU_default_x_ro]
bind_address=0.0.0.0
bind_port=6449
destinations=metadata-cache://MySQLCLU/default?role=SECONDARY
mode=read-only
protocol=x