That's on your smart TV, right? Typically when we see results like that on a computer we suggest TCP Optimizer. Optimizing the TCP and MTU settings will often bring the single thread score up to the multithread result level. You may not be able to change these settings on your TV, I would almost bet that you wouldn't be able to.
Sometimes if the drive performance is lacking single thread tests here will suffer.
Here's results from a Macbook. The first 9 results were taken with a failing mechanical HDD. The last 4 stable results were taken after the HDD was swapped for a SSD.
In hindsight I should have done some multithread tests to show you that multithread is usually unaffected in this scenario. But I didn't know I'd be sharing the results at the time... I just wanted to quickly fix my friends laptop. I could tell just by how the first few tests felt while they ran that it was the hard drive holding it back, plus I had already diagnosed it with multithread test comparison a month prior. Did a swap for SSD, rebooted and instantly 90 Mbps ... over and over again. Everything ran better by the way... I just tested it through the Internet and TMN. ... Note: if I only had 15 Mbps Internet I wouldn't have been able to see the issue. It's only at extreme speed that you can start using TMN for purposes beyond what I originally intended it to be used for.
It's not always the Internet connection and ISPs fault. Hardware can hold you back too. TestMy.net is not just a bandwidth test... it started as a bandwidth test but at higher speeds we've found it does much more.
Those results (from a TV on your connection type) look good to me. That's a comfortable speed to surf at. It would be better if both types tested at 35+ but I wouldn't get too hung up on it either. That's not a bad performance. It may be held back by the speed of the TV's memory... why things like that only affect my classic test, I don't know.. they just do. But now, when you get your next tv... you'll know how to benchmark the difference.