The only thing that seems to have any noticeable effect is raising your TextureMemoryBudget =XXXX as close to 1600 as you can. You need to ensure you have enough VRAM left over after raising the value however, meaning people with less than 3 GB of VRAM are out of luck, as the default value for your system is probably close to your maximum. The tweak does not seem affect every system the same way. My system benefits enormously from the tweak, with any sort of pop-in kept to a bare minimum. Others receive no benefit at all.
As of 1.08+, the pop-in has gotten much, much worse across the board. Even with the tweak, I am getting more graphical errors than ever before. There is nothing to do aside from that, unfortunately.
On a side note, take some time to research your issues before posting. This is a very commonly discussed topic on threads all over the internet.