Yeah, that's not a good thing. It wasn't sustainable last time, and it wont be this time either.
I maintain that the 10-week period between Jan and March with average daily growth of 1.8% was sustainable but we had to go and ruin it
Until BTC finds its true price I'll keep harking back to that trendline which was one of the most 'stable' Bitcoin has ever seen.
Also, we are obviously seeing a correction of the overselling following the April 10th crash. It's more of a gain than growth I suppose.
We actually saw (only!) a 36% gain on April 17th.
Here are all the days with a 20%+ close-to-close gain: