I tried this several times during the night and ultimately I don't think it make much, if any, difference on LTE. My numbers anyway are too eradict to say anything improved, and at first I thought it slowed down, but I think it had to do as much with a reboot as anything. Here is a sample of what I was getting ...
Before
After
Tried again later in the night ...
With
And without
hmm, it must not apply for 4g then