Thanks for sending over all the additional info here - we appreciate it.

Based on the results you've got, and your description of the issue (seeing the latency spike when you visit a website) - this honestly looks *very* reminiscent of bandwidth saturation. If you're interested, we cover the topic of bandwidth saturation in quite a bit more detail here:

http://www.pingplotter.com/wisdom/article/bandwidth-saturation.html

Hopefully this helps out. If you have any questions, or if there's anything else we can do to try and be of assistance - just let us know!

Best wishes,

-Gary