Grab a Chrome Performance Trace from your window.

1. Open the devtools if they are not already open. You can find them under the Cursor Help menu.

1. (Optional) Pop the devtools out into another window by clicking the 3 vertical dots and then the leftmost icon.

1. Navigate to the Performance tab. If your window is narrow this may require clicking on the double arrows.

1. Click the record button in the upper left. This will begin recording a performance trace.

1. Do whatever you were doing before that caused lag / stutter / freeze. Try to capture multiple instances of the bad behavior.

2. When the buffer is getting full or you’ve grabbed a few instances, hit the Stop button.

1. (Optional) Take a look at the profile. If you have a hunch about the problem, take a look at the Annotations tab on the left side. Navigate around and Annotate the profile descriptions of what you were doing or what your suspicions are.

1. Hit the Save Profile button and select Save trace. The default name is fine, as it includes a timestamp, but feel free to add even more context to the filename.