Can you please attach a chrome trace? Specifically an input event trace.

See: https://www.chromium.org/developers/how-tos/trace-event-profiling-tool

Then we can see the timing between events and if so sent it to the kernel team to look lower in the stack.

I recorded input latency trace. I clicked record, switched to another tab, moved mouse cursor, scrolled web page then finished recording trace. Mouse movements and scrolling were choppy.

Deleted: trace_trace.json.gz 6.7 MB

trace_trace.json.gz 6.7 MB Download

Tried workaround I mentioned here https://bugs.chromium.org/p/chromium/issues/detail?id=582794 but it didn't work.
Sometimes bluetooth performance is very bad and I experience significant lag when I move mouse pointer. I'm currently using USB mouse and it works excellent.

Tried another BT mouse - same result. BT headset seems to be working well.

Thank you for providing more feedback. Adding requester "dtapuska@chromium.org" for another review and adding "Needs-Review" label for tracking.

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Same BT mouse works well with the same Chromebook with Debian GNU/Linux installed on it. So it's not a hardware problem.

we tested on our speedy with of couple of BT mouse. We didnot find any problem with using the mouse for scrolling pages

can you let us know the BT mouse model which you are using?

I use A4Tech BT-630 and Logitech M535
They both produce lag on scrolling pages.

I used the logitech M535 mouse and didn't see any log.

can you share the link to the page you are trying to scroll and if possible

Can you please share any video or repro so that we can try again at our end.

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No feedback was received in the last 30 days from reporter "ponymarzanna@gmail.com", so archiving this. Please re-open or file a new bug if this is still an issue.

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Here is the video I recorded. First test with wired mouse. Almost no lag. Then with BT mouse: it jerks page on scrolling. It happens on pages with mixed contetent (text, images, videos).

Deleted: BT_Mouse.mp4 10.9 MB

	BT_Mouse.mp4 10.9 MB View Download

I just bought a Asus C302 Flip Chromebook, Google Chrome OS Version 63.0.3239.116 (Official Build) ( 64-bit). It cannot use my Logitech unifying receiver as it does not have a USB-A port. So I decided to use a bluetooth mouse.

I bought a Logitech MX Master 2S bluetooth mouse. Most of the time a single mouse scroll click would scroll the page a line or 2. However, every now and then (1 out of 10?) it would jank; ie: jump many pages; often to the end of the document. This meant I lost my place which is very disruptive to reading :-( and I would have to scroll _carefully_ back. I tried seeing if I could get used to it but it was so bad that after less than 1 hour of use I returned the mouse to the store.

I then tried a Microsoft Sculpt Bluetooth mouse. Better but still janky. I did discover that I could significantly reduce the jank if I wiggled the mouse right-left before scrolling. It seems to me that when wiggling the mouse the cursor janks which is far less irritating than having the page move to a random location. While wiggling the mouse reduces the scrolling jank it is annoying to have to do this and the scrolling can still be janky.

I also tried the Microsoft Sculpt Bluetooth mouse on a Lenovo 13 Chromebook, Google Chrome OS
Version 63.0.3239.116 (Official Build) (64-bit). A wireless mouse scrolls perfectly. The Microsoft Sculpt bluetooth mouse is less janky but still the jank is noticeable.