MacOS – MBP Retina 2015: Graphical glitches after update to 10.12.4

This bug is known to the Chrome developers and has been filed under...

Issue 90461: Dictionary keyboard shortcut doesn't work in Lion

Basically the problems are timing issues for some websites which take too long to respond to information needed to show the dictionary.

This is what @resek@chromium.org says:

There's likely not much that we can do here. We have to block the UI thread to implement this feature, which is bad and so that's done on a timeout. If the web page takes too long to respond for the information we need to display the popup, we give up and unblock the UI. If we didn't do this, Chrome would look like it's hung, waiting on the web page to respond.

We collect timing information about this, and most pages succeed well below the timeout, but there's also some class of pages that do not respond in time (more than 1500ms, which is what starts to be perceived as sluggish/hung).

I would definately diagnose with Apple's hardware test but you can also look through the system log.

You should be able to see if a particular application/service is causing this issue.

System logs are in /var/log/system.log

Take special note of the TIME when an application crashes and then go into the log and see if there is something related to the keyboard/trackpad; or any particular patterns. You may find that after a crash a service is restarting and that service is consuming either

• enough resources to put the keyboard/trackpad out for 10secs
• there is an I/O conflict.

Worst case scenario you can (painstakingly) format.

I would be looking at why your computer is crashing in the first place and prevent such application(s) from crashing.