Steam downloads for instance use to peak consistently around 2.2 - 2.3 MB/s easy for the last 2 years or so, now I am lucky to get 1.6 - 1.7 MB/s. Everything thing else in general from all over, download sources are way down. I have even purchased a new ADSL modem to test out if the old modem had and issue, they are both the same (put the old modem back in place).
I done a heap of speed tests, before this slow crap started happening I was getting consistent 18-19 Mbps, now all I can get is 14 - 15 Mbps. I live right next to the exchange cabinet, literally only a few meters away. No way slingshot are going to say anything to their customers about this, I be pretty sure they will just drive the knife in the customers back and twist it for good measure. My line rate connection is just a high as its ever been, can definitely feel the brakes are on hard.
There is no way I can prove anything, and yea I would be open to slander because of all the so called "variables", but I have reason to believe the unlimited ADSL plan from slingshot is being throttled as of recently. I was on the 250GB plan (no issues), and was assured that the new unlimited $89 plan a few months back had the throttling removed from it, which I had no issue with the change over (just the same as the 250GB plan). If I were to guess, then it may have something to do with the $89 unlimited plan being adopted by current and new customers, many will be in this ship now and it something had to be done to keep it floating, throttle the speed.