Oh yes I don't deny that some people have problems with pepperflash, just as I had problems with the regular flash player. I just deny that disabling it is the cure all for everyone ....
Strangely, I can now use pepper, or the regular flash player in Chrome with equal success, and I can even use Opera again, which I haven't been able to do for over a year.
I might try Firefox again, or Dragon, or anything other than Safari or IE .... just to see how they play.
Oh and when I use one version of flash in Chrome, I disable the others. I have three versions of flash, one is the regular pepperflash, one is entitled pepperflash debug, and the other is just the regular shockwave flash. All version 16.0 something or other ... I don't think I've tried the debug type yet but I might try it to see what it do ... :-)
To answer your post script : Because it used to happen when I used Opera back in 2009-10 ... sometimes my eye-hand co-ordination is spot on and other times, I'm lazy on the meter. I have a method of following the leading edge of the power bar during the downswing part way down the scale to determine if I want to abort the swing or not ... and then shifting my focus to where I want to click, and click at when I know is the right time, based on my peripheral vision. Usually when I miss late, I know it's because I've followed the line for too long. Sometimes it's because the meter has changed speeds ...
Edit: I don't see enough justification for blaming pepperflash alone ...
2nd Edit: I also remember back in 2009 getting those horrible meter spikes when using the R9, where the power bar would jump in a milli-second nearly to the extreme right end of the scale ...