onTouchStart fire extremely slow in ios9.2'safari

[aaronwng]

onTouchStart fire extremely slow in ios9.2'safari.slow then onClick. is this a bug?

[jimfb]

Can you provide two jsfiddles? One to demonstrate that it is fast without React, and another to demonstrate that it is slow in React?

[jimfb]

No response for two weeks. We can re-examine this issue if OP can demo the problem.

[aaronwng]

sorry,so busy these days. i will provide jsfiddles as soon as possible, . i could simply describe the test method.just a really easy example, like these below,

var Test = React.CreateClass({ handleTouch:function(){ alert('touchStart'); }, render:function(){ return ( <div onTouchStart={this.handleTouch}></div> ) } });

this alert will show very slow after i touch [div] element on screen on ios9.2'safari , but,other browser like chrome perform normally.

[enriquetuya]

@jimfb could this issue be reopened base on the comment above?
#5817 (comment)

[enriquetuya]

@biblesyme are you experiencing the same with the latest 15.0.1 version?

[gaearon]

The example above doesn’t demonstrate that the lag doesn’t exist without React.
Are you sure it is React-related? Can you show this with a fiddle?

[aaronwng]

reactExample(https://jsfiddle.net/69z2wepo/39302/)
planJavascript(https://jsfiddle.net/n5furn55/6/)
jquery(https://jsfiddle.net/hdojb5zm/)

it seems as a safari problem, but, is anybody could explain why it's so slow to trigger a touchstart on safari, and how to solve this problem
@enriquetuya
@gaearon
@jimfb

[aaronwng]

hi guys,it's seems not because safari 'trigger' touchstart slow,but 'alert' slow. i don't know why.

and, may i ask what's time React will support 'tap' event, it's seems not difficult to achieve this

[enriquetuya]

@biblesyme check this out: https://github.com/zilverline/react-tap-event-plugin#introduction

We did not solved our problem using that plugin though, we ended up using https://github.com/ftlabs/fastclick

This issue relates to: #436 and #1170