This is the norm for all of Gaga's new singles though (minus BTW), TEOG did the exact same and then a week later when it got a radio release (which Applause is getting 8/20) and a video, it re-surges, which, hopefully, Applause will.
Considering that it's selling a bit more than HALF of what Roar is selling is a good indicator of its future performance. And we thought Gaga had the first week. Seems like Perry has earned herself both the first week and the longevity.
i think it may drop a bit but it will start climbing again with more radioplay/VMA promo/music video yall needa simmer down now, it's only been out like 2 days