400 items - Performance issues - Slow

[alvarotrigo]

Describe the bug

With a list of 400 issues I experiement performance issues when working with the single select box when:

• Searching for a text
• Clicking on an element (takes more than expected to hide the item)

To Reproduce
Go here: https://codepen.io/alvarotrigo/pen/PowgMmw
Search for a text such as "flkjadslkfjaslfjlakjf"
Or just click on any item in the list, you'll notice how it doesn't close as fast as expected.

Screenshots
See a video here:

Desktop (please complete the following information):

• OS: latest Mac OS X Catalina 10.15.2
• Browser Chrome
• Version: lastest Chrome version 79.0

[alvarotrigo]

Just as a note.
The same list seems to work smoothly in Select2. So I assume the issue can be dealt with somehow.

[abarrak]

Still an issue in choicesJS @alvarotrigo ..
I wonder weather the root cause the highlight behavior and how to disable it ..

[Xon]

This appears to be something todo with the css/html for the select-select mode. The multi-select works fine.

I actually prefer the multi-select UI even for single item, so I've hacked that into my own fork. The documentation (and config name) will need some cleanup.

[Xon]

There was an O(N^2) behavior in search, since v11.0.0-rc8 was deployed it looks to be working better.

There is a stall when stopping search, but an that is because it is re-rendering all the choices