Hello and thank you all,

It's comforting to see so many comments trying to help me :-) !

Today, I probably won't have time to analyze all the messages, do the suggested tests and answer each one. Please excuse me

I just confirm to OldMuso that my Dell XPS 18 (1820) has the configuration indicated in his link:
- CPU: 2.6GHz Intel Core i7-4510U (dual-core, 4MB cache, up to 3.1GHz with Turbo Boost)
- Graphics: Intel HD 4400 graphics
- RAM: 8GB Dual Channel DDR3L (1,600 Mhz)
- Screen: 18.4-inch 1,920 x 1,080, LED Backlit Touch Display
- Storage: 256GB SSD
- Ports: 2 USB 3.0 ports, media card reader, headphone/mic jack
- Connectivity: 802.11b/g/n Wi-Fi, Bluetooth 4.0
But, even if this configuration is a little weak today, it has been quite sufficient for me so far, at least with my previous version of Band in a Box which was the 2020.

Have a good day!

Lazy Bird