The best I can do is these speed test Results
The SNR does not change so it would seem that DLM is not to blame, the line attenuation is steady at 40.5db
The connection speeds, possibly called sync rate or line rate, are normally on the line above those two figures.
All three lines read at the same time would be useful
Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
My broadband basic info/help site - www.robertos.me.uk.
Domains, site and mail hosting - Tsohost
Connection - AAISP Home::1 80/20. Sync 65618/13914Kbps @ 600m. BQMs - IPv4