Fresh install moOde 8.3.7 - system slow and busy

[Nutul]

Dear Notul,
I don't want to cause controversy but perhaps you didn't read my answer carefully - I read and reread the documentation but nowhere did I read that it was necessary to set the parameters in the Pi Imager app as I wrote in my post so it's possible to make a mistake - also as I wrote I had never used Pi Imager but for version 8 Balena etcher.
I don't expect the documentation to be so detailed and once again I thank Tim for his commitment.
For the rest I just hope that my experience and the information I have indicated in my post can be useful to other users - after all, this is what the forum is for.
Cheers.

Please... from the downloading section at moodeaudio.org

Download moOde™

Read the Setup guide for information on how to use the Raspberry Pi Imager to prepare the ISO image with SSH, a login userid/password and optional WiFi SSID/password before writing the image to the boot media.

and the first 30something lines of such guide:

################################################################################
#
#  Setup Guide for moOde audio player
#
#  Updated: 2024-02-10
#  © Tim Curtis 2017 http://moodeaudio.org
#
################################################################################

GENERAL INFORMATION

Access moOde using a Browser and one of the URL's below. After opening moOde
in the Browser use the IOS or Android "Save to Home Screen" option to create a
moOde App on your home screen. There is no need to download anything.
http://moode, http://moode.local or http://IP_ADDRESS

OPERATING ISTRUCTIONS

Instructions for configuring and operating moOde are contained in Quick help
which is located on the "m" menu and at the link below.
https://github.com/moode-player/docs/blo...ckhelp.pdf

MOODE OS IMAGE

For improved security the OS image does not contain a userid, WiFi SSID or
Access Point password, and Secure Shell (SSH) access is disabled.

  1. REQUIRED: The official Raspberry Pi Imager is required to enable SSH,
  create a userid and password and optionally set the host name and WiFi SSID
  and password. If a host name is not set in the Imager then the default
  host name "moode" will be used.

  2. REQUIRED: Userid, password and SSH are required otherwise moOde will not
  function correctly.

  3. REQUIRED: An Access Point password is required and is set after first boot
  in the Network Configuration screen. This allows moOde to still be accessable
  if it cannot connect to Ethernet or any configrred WiFi SSID's.

Nothing personal, of course.