1. Performance
Now the lagging in rapid tapping is better. In the latest apk, upon rapid tapping(4 fingers quickly tapping, my phone supports up to 4 fingers multi touch), the obvious lagging on my phone is relieved. In the previous version, it was quite serious. But for the move of the drum, I think reserving for the users' choice will be better. Maybe for my phone is older, it is on. But for not ticking that option, it could be disabled. Or make a extra option for toggling this option.
2. Skip button
The skip button seems working fine. Till the moment, no malfunctioning of this function is found.
3. Song List might got disappeared upon certain condition (Minor)
Situation:
I got the problem, when I choose the song Sakuranbo made by Rolled, I tried to slide to the first of the song list. Upon the animation of song list was playing(a little bit going right of the screen), I tapped the left hand side blank area (just with the beatmap background), the song list may get disappeared. But after one more slide/tap motion, it will come back.
Further try to reproduce: When I choose Sakuranbo made by S i R i R u, repeating the situation above mentioned. It can also be reproduced. Till the moment, I cannot try to reproduce the phenomenon with every map.
Screencap:

Normal One
One situation:

half of the song list shrunk into the right hand side.
For the whole disappeared


4. Song List (Minor)
Upon choosing Ikimono Gakari - Kimagure Romantic, the background pic is not in the aspect ratio of the screen. The right bottom corner of black area may keep blinking with the song list tabs remained there.
Screencap:

the right bottom corner got certain maps tab remaining in the blank area and blinking upon browsing through the song list.
5. The fast appearing beat problem
Till the moment I cannot find which map I meet this problem. But I tried to check it through(but only one map for one or two difficulties, not all). It seems no maps got this problem. For this problem, maybe just closed for this problem. I can't really remember what map I have played that time.
6.Force close when using back exiting the app
It occured at the first time I start up of the app right after the installation.
I just played once and then directly back to main menu and back to quit app.
If I don't remember it incorrectly, it should be Arashi - Everything made by al2e10, normal difficulty.
But only once, I tried few other start ups of the app, and played other maps. It cannot be reproduce at the moment. And for this apk, and the previous apk, they only hanged up at the first start up after installing the apk.