locohost - well i've spent some serious amount of time getting that done. also it's been there all the time, i've just made it clear that starting tommorow it will go on a huge sale (75% off) so it will be around 7.5$ for 10 days. i don't see why that would be an "ad".
since it's christmas time - everyone is putting their sales in their signatures, just for the reason because someone might notice something they like and buy when on sale, because there's a huge amount of stuff in store.
and now to the topic - like fimbul said - people max out fillrate or overuse memory - device gets clogged and gg. you can try my demo provided on my template (you don't have to buy to try it) - if you spam enough bombs particles overload your screen and fillrate your framerate is going to drop even on a SLI system. (i have gtx980) and it happens. still though it's good for testing purposes and in options you can disable particles and see the "big" difference when fillrate is less.