CM hangs when unfolding

peterkroon · December 23, 2015, 2:58pm

Go to: http://codemirror.net/demo/folding.html
In the editor with the title JavaScript do Ctrl-A and paste the paste all the code from http://codemirror.net/lib/codemirror.js
Move scroll-thumb to the top via mouse
Click on the gutter on line 17 to fold
The code folded very quick
Click again on the gutter on line 17 to unfold
The first time the unfolding takes a lot of time

Is this the internal CM caching at work or a bug?

Chrome stable Windows 10 64bit

marijn · December 28, 2015, 9:51am

Following those instructions, unfolding take 75ms for me, which I don’t think qualifies as a lot of time. Does it happen for you on all browsers? Can you profile and tell me where the time is spent?

peterkroon · January 14, 2016, 2:14pm

It’s a Chrome issue. When 8 windows with 10-15 tabs in it are open, Chrome does not behave properly.
Changed profile and tried it with only 1 window+tab, all is OK.