Definitely use the SEARCh function here on WHT to do research first, and you can also search online for reviews or through hosting review sites.
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Basically it is depends on how many vps in one box.
We don't limit our network speed for all the vps in the same box, even the speed option can be set in solusvm. Furthermore, we only limit the vps/box not more than 10.
You always can try to ping and see how fast the respond is.