Tested this on Windows-10, chrome version(51.0.2704.29(reporter's good build)), latest beta(51.0.2704.47) and the latest canary(52.0.2734.0) and didn't observe any visual lag on scrolling/clicking/loading of the new pages.

duart012@: Do you see this on the latest beta(51.0.2704.47) as well? Also, check by disabling all the extensions and update here if that makes any difference.

Thanks for submitting this bug with the trace. There are large (1.5 second) blocks of JavaScript executing one each frame, which would definitely produce the lag you're describing.

Can you attempt in incognito mode, and see if it reproduces there? If not, which extensions do you have installed?

I went ahead and updated from "Version 51.0.2704.36 beta-m (64-bit)" to "Version 51.0.2704.47 beta-m (64-bit)."  The problem persisted even after relaunching to the new update.  

I disabled all extensions and started working through each extension individually.  It appears the culprit is Adblock Plus version 1.11 (https://chrome.google.com/webstore/detail/adblock-plus/cfhdojbkjhnklbpkdaibdccddilifddb?utm_source=chrome-app-launcher-info-dialog)

After disabling Adblock plus, performance immediately returned to pre-beta status.  No visible display lag, slow loading of pages.  I've attached two logs in case that is helpful.  One with adblock disabled, one with it enabled.

Deleted: trace_Adblock_Plus_Enabled.json.gz 10.4 MB

trace_Adblock_Plus_Enabled.json.gz 10.4 MB Download

Deleted: trace_AdBlock_Plus_Disabled.json.gz 10.4 MB

trace_AdBlock_Plus_Disabled.json.gz 10.4 MB Download

Devlin, do we have a contact at ABP we could alert to this issue?

@4 First we need to make sure it's not our fault. :)  This sounds like issue 608444, which was caused by  issue 606207  (+littledan).  The merge for 606207 should be going into M51 soon.  @duart012 - if you wanted to experiment, you could confirm whether or not you see the same lag in Chrome Canary, which has the fix for 606207.  Otherwise, I'm hoping we get the update out soon.  litteldan@, is there a timeline for when that will be reaching M51?

The changes are all merged and should be in the next 51 Beta release.

duart012, if you want a preview of the fix, it has already landed on the Canary and Dev channels. The Beta fix should be out by Wednesday.

Thanks all.  Finally had an opportunity to test -- works great on Version 51.0.2704.54 beta-m (64-bit).

Was not able to reproduce behavior from earlier beta versions.  ABP among other extensions are working as intended.

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

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

@duart012 -- Thank You for the update. Marking the issue as Won't Fix as per Comment#9.
Please feel free to raise a new bug if the issue again occurs.