MacBook Pro 2019 Touch Bar lagging when Changing Volume

Solution 1:

I’ve had issues with my touch bar too. (See Touch Bar not turning on after waking computer from sleep.)

Here are some things that didn’t work for me, but they might work for you:

1. Open Activity Monitor, find and select TouchBarServer, then press the Stop button. Then select Force Quit. It should restart automatically and your touch bar should be back to normal speed and responsiveness.
2. If step 1 doesn’t work, try resetting your SMC: https://support.apple.com/en-us/HT201295
3. If step 2 doesn’t work, try resetting your NVRAM/PRAM: https://support.apple.com/en-us/HT204063

Solution 2:

You could try toggling on/off touch bar zoom in Accessibility. From the Apple Community:

1. Go to System Preferences > Accessibility > Zoom
2. Toggle on/off Enable Touch Bar zoom.

You can read more information about Touch Bar Zoom if interested.

(Answered separately as this is a different potential solution and doesn’t require a restart.)