@spyro Please don’t hijack other people’s threads with off-topic statements just to express your frustration.
By the way, the slow file transfer is not a general issue, but rather a specific problem with your instance, as I have already shown you here: Photo viewing cripples server - #6 by bb77
@Dom_Jag Depending on the web server and PHP process manager you are using, further settings and tweaks may be necessary… Uploading big files > 512MB — Nextcloud latest Administration Manual latest documentation
If that doesn’t help, please post more details about your setup.