I just upgraded to 1GB service with Xfinity. Prior to this, I had whatever the 300MBs with boost package. I would consistently get between 250-350 MBs speeds when testing with SpeedTest. I just upgraded to Xfinity 1GB and now I am getting speeds from ~20s to maybe 40 at best.
I've seen this same issue with no answer so far on this forum. Should I just downgrade to the 600MBs service? Maybe even back to the 300MB service with boost? No point in paying more money for less bandwidth.
Which model number of modem do you have ?