Its weird. Many cryptonote currencies seem to have the same effect. A hashrate increase of roughly 10x in the last few days.
I doubt suddenly everyone started mining them. Unless there have been developments like a new gpu miner that I don't know of. In which case, cpu mining (the main thing keepeng them attractive to miners) is gone
I've been using Claymore's GPU miner since the beginning...
That's not new. GPU miners for cryptonote coins while better than cpu are still not that much better like in other algos.
The sudden increase in 3 cryptonote coins I usually mine all in a very short time puzzles me
My 1050 does ~225 and my i5 does ~80. So still around 3x. I'd say that's quite a bit better. I just use both at the same time.