I agree with all that's said above, but a connection at 57 Mbps is way more than you need for a TV connection. How did this come to your notice? Is there a fault with the picture display? If so there might be another fault.
I was looking for information online for this particular TV, which I purchased two weeks ago, and came across a YouTube channel that gave a lot of good information. https://www.youtube.com/watch?v=PIef8iRZhLE It talks there about the LG Ethernet port being limited to 100 Mbps which could be overcome by using a USB/Ethernet adaptor in the 2.0 USB port. I tried this and found it did indeed improve the speed but still did not achieve the 100 Mbps LG limit. In fact, it varies from between 40-80. This morning it was 57. My inquiry stemmed from that YouTube information.
As regards picture problems, cannot say that there are any other than the revolving ‘busy’ icon, which appears when I’m using the apps. That said the program that I was streaming last night (not 4K) went off three times, showing a blank screen for about 30 seconds each time. My inquiry is to do with why am I only getting these speeds given that I have a 500 Mbps internet speed, and if LG is limited to 100 why am I not getting at least that?
When I contacted the retailer this morning about it, he said the TV was not limited and was more likely to be a VM problem, which is how I came to open this thread.