Perfermance issue: drag and drop with sound

[qb200210]

sent. in the same sample project, I also included samples for my other found bug:

Regression bug: forever loading on iPhone

Problem: we need to use the html5 outputs in the Wechat browser on iPhone. It was working fine on v8.3.0. But when it got to v8.3.1, the page will stuck at the blue loading circle when turning from a page with video to the next one with video. I understand there were improvement done for safari in v8.3.1, but apparently those improvement somehow broke the flow of the presentation in Wechat on iPhone. I verified it by playing the same presentation that was output from 8.3.1 to that of 8.3. 8.3.…