LrC 15.3.1 Export Performance Issues on Mac Studio M1 Max – High CPU, Low GPU/Render Utilization

Hi everyone,
I'm experiencing severe export slowdowns in the latest Lightroom Classic 15.3.1 on my Mac Studio (M1 Max, 24-core GPU, macOS Tahoe). Exporting 500 high-res RAW images to maximum quality JPEGs takes way longer than it used to, and my hardware is not being utilized properly.
During the export process:
•    CPU usage is pinned at nearly 100% (Full Red).
•    GPU Utilization sits around 60-70%.
•    GPU Render and Tiler utilization drops down to just 5%.
•    ANE (Neural Engine) utilization stays at 0%.
It seems like a massive I/O or processing bottleneck where the CPU is completely choked, while the GPU is just sitting idle waiting for data.
What I have already tried (which only partially helped or didn't fix the underlying bug):
    1.    Camera Raw GPU Config Fix: Checked the Camera Raw GPU Config.txt file and noticed crs:gpu_preferred_system="" was completely blank. Cleared the entire GPU cache folder and forced LrC to re-test the hardware.
    2.    Hard Reset: Performed a full preference hard reset using the Shift+Option+Command shortcut on startup and cleared all Lightroom cache folders. This improved the speed slightly (now around 2-5 seconds per frame), but the hardware imbalance remains (100% CPU vs 5% GPU Render).
    3.    Lightroom Performance Settings: GPU acceleration is explicitly set to Custom with both "Use GPU for image processing" and "Use GPU for Export" checked.
    4.    Export Settings: I am not using any Output Sharpening, Watermarks, or custom File Naming sequences that typically slow down exports. My Camera Raw cache is cleared and set to 100GB.
Why is the single-batch export engine in v15.3.1 so poorly optimized for Apple Silicon compared to older versions where the GPU actually did the heavy lifting and the CPU stayed quiet? Is there any other hidden config file or setting to force proper GPU/ANE load distribution?
Thanks!

Lightroom Classic version: 15.3.1 [ 202605261338-e36f8566 ]
License: Creative Cloud
Language setting: lv-LV
Operating system: Mac OS 26
Version: 26.5.1 [25F80]
Application architecture: arm64
Logical processor count: 10
Processor speed: NA
SqLite Version: 3.36.0
Adobe GSDK Version: 1.4.0.213

Built-in memory: 32 768,0 MB
Dedicated GPU memory used by Lightroom: 587,8MB / 25 559,0MB (2%)
Real memory available to Lightroom: 32 768,0 MB
Real memory used by Lightroom: 5 342,4 MB (16,3%)
Virtual memory used by Lightroom: 449 898,2 MB
Memory cache size: 1 188,4MB
Internal Camera Raw version: 18.3 [ 2530 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 1690MB / 16383MB (10%)
Camera Raw real memory: 3344MB / 32768MB (10%)

Cache1: 
NT- RAM:0,0MB, VRAM:0,0MB, Combined:0,0MB

Cache2: 
m:1 188,4MB, n:0,0MB

U-main: 151,0MB

Standard Preview Size: 5120 pixels
Displays: 1) 5120x2880, 2) 2560x1440, 3) 2560x1440

Graphics Processor Info: 
Metal: Apple M1 Max
Init State: GPU for Export supported by default
User Preference: Auto
Enable HDR in Library: OFF
GPU for Preview Generation: Auto (S5_24)

Application folder: /Applications/Adobe Lightroom Classic
Library Path: /Volumes/4TB-LEXAR/2026/2026.lrcat
Settings Folder: /Users/kasparssilins/Library/Application Support/Adobe/Lightroom

Installed Plugins: 
1) AdobeStock
2) Aperty
3) Aperture/iPhoto Importer Plug-in
4) Aurora HDR
5) Calibrite Camera Calibration
6) ColorChecker Camera Calibration
7) Export to Photomatix Pro
8) FilterPixel-Edits
9) Flickr
10) Imagen plugin
11) Impossible Things
12) Impossible Things Help
13) Lightpanel 2025
14) Logi Plugin
15) Luminar AI
16) Luminar Neo
17) Neurapix
18) ON1 Photo RAW 2025
19) Peakto Opener
20) Radiant Photo
21) Radiant Photo 2
22) Reblum
23) Retouch4me Arams
24) Topaz Photo (Studio)
25) Topaz Photo AI

Config.lua flags: