It not a simple slowdown and is frustrating due to the architecture of the modern internet content hosting and I suspect however TM is rate limiting its customers. e.g.
1) some youtube videos play fine, others stall and simply never load.
2) I cannot play anything on soundcloud.com, plays first 2 seconds then never recovers (however if I switch off wifi and use Maxis 4G mobile connection it works fine).
3) Animated gifs take ages to load and stutter
4) torrents stream perfectly: I can fully utilise my upstream and downstream bandwidth
5) Netflix has no problems (I use a dynamic DNS to get USA content)
6) iOS App updates depend on time of day, during the day they are fine, at early evening peak hours they crawl.
7) Downloading any large file from a website is very slow at all times
It is a pity TM won't purchase/route capacity through an alternative link, having throttled internet for a month is terrible service...