Apple has released a bug fix software update for macOS High Sierra 10.13.6 aimed specifically at Mac users who own the latest 2018 model year MacBook Pro with the Touch Bar.
The update is labeled as “macOS High Sierra 10.13.6 Supplemental Update for MacBook Pro (2018)” and apparently aims to resolve a problem where the new MacBook Pro Touch Bar models were sometimes dramatically underperforming due to thermal issues with the processor, causing the CPU to throttle itself significantly. Installing the bug fix update should therefore resolve the performance issue.
As always with any software update, be sure to backup the Mac before installing the patch.
Owners of the impacted MacBook Pro (2018 model only) will find the supplemental update available to download now from the Mac App Store Updates tab. Optionally, eligible users can download the update directly from Apple at the link below.
If you have a new 2018 model year MacBook Pro with Touch Bar (or are planning to buy one) then you’d certainly want to install this supplemental software update right away to that machine.
Other Macs are not impacted by the bug, and therefore do not need the same software update.
Release notes accompanying the download are brief and say the following: “The macOS High Sierra 10.13.6 Supplemental Update improves the stability and reliability of MacBook Pro with Touch Bar (2018) computers and is recommended for all users.”
The software update appears to come in response to what multiple MacBook Pro 2018 users have discovered, where, when the computer is placed under heavy workloads requiring significant CPU activity, the processor speed would throttle down considerably, apparently to prevent overheating. In a YouTube video that gained some attention, one YouTube video blogger discovered they could only get the processor to perform at top speed if the computer was placed into a freezer.
While this particular update is for macOS High Sierra, presumably whatever the fix is will be included in an upcoming updated version of macOS Mojave beta as well.
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