Not sure who owns this... I started this 5 years ago but I don't feel responsible for it.

Is there any way to find out if the device is touch enabled or not. @alexandrudima ?

I can look into this.

@bpasero I don't know

'ontouchstart' in window and some extra checks could do it, see https://stackoverflow.com/questions/14439903/how-can-i-detect-device-touch-support-in-javascript.

I have tested the above check on my MBP and X1 with the results one would expect...

Also https://bugs.chromium.org/p/chromium/issues/detail?id=784027&can=2&q=addeventlistener%20touch&colspec=ID%20Pri%20M%20Stars%20ReleaseBlock%20Component%20Status%20Owner%20Summary%20OS%20Modified from #37818 so it may just get fixed on Chrome's end.

@jrieken I have pushed a potential fix for this, however the results are not that much different than your initial run
Maybe you could get latest and re-run to double check?

I double checked if the touch check works on my mac (false) and x1(true) and all is good.
Also to note is that I made the isTouchDevice a const so in this version that check would be done once on startup instead of making it a func and checking every time.

Maybe you could get latest and re-run to double check?

No, the slow bit is creating Gesture-objects and when you just prevent that from one user, all others will still be slow... and you still do that

Can we fold this into Gesture itself so that every client benefits from this performance fix?

There following problems should be tacked (ideally in this order)

1. don't create too many gesture object as its creation is slow, e.g. only create one per action bar not per action bar item. maybe just one for the whole document to share?
2. revisit using Gesture for click/tap events. That's the main usage and questionable
3. diable gestures for devices without touch

Fixed via #38946
Seems like we save around 40ms on startup.

I verified all the touch behavior works as before including the balistic scroll. Just fyi @joaomoreno @alexandrudima in case somebody reports touch scroll issues in the editor or the tree that you assign to me.