Ping times from point a to point b might be important here. Also if your computers route to Walmart.com is messed up (you see loops in the route) then it isnt

Ping times from point a to point b might be important here. Also if your computers route to Walmart.com is messed up (you see loops in the route) then it isnt a function of connection speed. Your ISP is not your connection directly to Walmart.com. There are other computers between Walmart and your ISP that could have screwed up dns tables. It could be Walmart server is closer to the other computer. For a more thorough test do some pings and traceroutes. I had no idea the difference would be so big for Walmart.com. There might be something else at play going on here like dns resolving problems.