First of all, I would like to thank you in advance for any help you can provide.
I am a teacher at an educational institution where we have access to a local network. Since I will need to share large sets of files with my students, I thought using torrents would be a great solution for when I need to send something to the entire class (about 15 computers).
I am currently testing this by sharing the Windows 10 installer ISO that I just downloaded, but I am encountering a problem. The first computer that started downloading it did so at a great speed, but as more computers connected, I noticed that each of them started downloading very slowly. Even my own computer, which is the original seed, began sharing the file at a much slower rate.

I don’t understand what could have caused this sudden drop in speed. I tried closing and reopening qBittorrent, but the issue persists.
In the settings, I increased the maximum number of connections per torrent because I thought perhaps I was sharing with a few problematic computers, resulting in slow transfers. However, even after changing this setting, the problem remains.

I would appreciate any guidance or advice on how to solve this issue, as I would like to use this method effectively throughout the school year.
Thank you!