You are comparing apples and oranges – MacMagazine and StiffProdutora are setup in different ways.
Although MacMagazine’s is hosted by LiquidWeb, it appears to be using the CloudFlare (http://cloudflare.com) Content Distribution Network (CDN) to cache and serve pages. Possibly LiquidWeb is reselling CloudFlare service, or MacMagazine purchased CloudFlare service themselves.
CloudFlare copies pages from a web site and distributes them to cache-servers all over the world (mostly northern hemisphere). When a user requests a page, they are sent to the closest CloudFlare cache-server, not the original web-host server. You will always see good ping times and page-load speeds to CloudFlare, because your browser is talking to a nearby cache-server.
StiffProdutora’s is hosted on DreamHost’s servers which are all in southern California and StiffProdutora doesn’t use a CDN. I believe MacMagazine’s web-host server is host.macmagazine.com.br (220.127.116.11), which is a LiquidWeb server in Michigan.
So pinging/tracerouting to 18.104.22.168 would give you a fair comparison between LiquidWeb and DreamHost. Generally, the farther you are from California/Michigan, the longer pings will take.
CloudFlare’s will work with any web hosting service, so you could use it with DreamHost. If you need the speed, you could sign up for CloudFlare’s free account plan and give it a try. This might help bobocat’s slow Australian page-loads too.