Whats slowing down my page loading times?

So i've been plagued recently with a terrible connection that just won't seem to go away, and has been getting worse.
At first we thought it was the router in our building (out of our control) but apon talking to the other residents (in a floor below and above ours) they've been having no connection problems what so ever. I watched a guy open Google, and it sprang open no problem, no waiting time.
I've since reset my Airport to default factory settings (fearing i've changed a setting I didn't mean to) and created a new Ethernet connection with the default DHCP. I really don't think its an issue with my airport, because even when I plug the Cat 5 straight into my computer, it still loads slow/not at all.
Its not throughput, because i've ran several speed tests on speedtest.net (never failed me before) and both my husband and I are getting 47,000 kb/s download and varying between 400-1100 kb/s upload speeds.
With all of that in mind, we consistently get 403 forbidden, and DNS errors when trying to connect to pages that usually work fine, such as gmail, apple.com and google. Known working sites, and they won't work. If i open a lot of pages, eventually one out of 7 or 8 will work, and when that one works theres no issues with it.
I feel really out of my element, because I'm not sure if its a proxy issue or what, because i don't have a proxy. It seems to come and go, and no one else has issue with it in my building.
Sorry if this really doesn't belong here, but we don't know where else to go.
Note, i can't contact my ISP because I don't speak there language, and I can barely talk to my landlords...we live in Korea.
link to my speed test: http://www.speedtest.net/result/412690208.png

Update:
Apon attempting to check this very post, I got a 403 forbidden (quite ironic).
I tried a new setting I was thinking of playing around with, which is to change my Airport from being a Bridge, to setting up a DHCP with my husbands computer getting his own IP... Seems to be working a little better now, but if anyone has anything to input I would be very appreciative.

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Line attenuation (Down/Up) 29.5 dB / 12.7 dB
Output power (Down/Up) 0.0 dBm / 12.9 dBm
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If the DNS process is slow, please try to use nslookup to verify if it is a DNS issue.
If the HTTP process is slow, please check if there is any tcp retransmission in the capture data.
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