Tonight I decided to do an install of the latest nightly on my Intel NUC 11th generation. It's the i3 model with an NVME boot drive that I installed Haiku onto.
From the moment it started the system fan went to full speed and even just moving the mouse or clicking menus was incredibly slow. Menus need multiple clicks before they respond.
The task list menu showed the acpi_task item at 100%.
I saved a copy of syslog to a USB and it contains the following lines repeated continuously.
KERN: set MTRRs to:
KERN: mtrr: 0: base: 0x40000000, size: 0x1000000, type: 0
KERN: mtrr: 1: base: 0x60000000, size: 0x20000000, type: 0
KERN: mtrr: 2: base: 0x80000000, size: 0x80000000, type: 0
KERN: mtrr: 3: base: 0x603d180000, size: 0x20000, type: 0
KERN: mtrr: 4: base: 0x4000000000, size: 0x10000000, type: 1