Apple this week released a Safari Technology Preview update that among changes appears to address a problem that surfaced with its new MacBook Pro laptops and ProMotion adaptive refresh display software.

The problem came to light when owners of the laptops — which were just unveiled last month — began using Firefox, Chrome, and even Apple’s own Safari browser on the MacBook Pro. They found scrolling was anything but smooth, despite the higher refresh rates offered by the new hardware.

Apple’s release notes for Safari Technology Preview 135 say it has addressed “lazy image loading, and updated smooth scroll animations to run at 120Hz on 120Hz displays.”

The issue cropped up quickly on user forums at MacRumors; the purported fix in Safari Technology Preview 135 was noted initially by 9to5 Mac.

First, a little background on how the issue has unfolded.

Last year, Apple introduced a major software change in support of the launch of its own M1 ARM-based silicon (The company is phasing out the use of Intel’s x86 processors.) Programs running on the new ARM-based silicon relied on an emulation layer until developers could update their code. (An emulation layer simulates the x86 architecture, so the CPU, file system and system information functions are all virtualized.)

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