How to Choose the Best macOS Version for NVMe speeds slowing down

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How to Choose the Best macOS Version for NVMe speeds slowing down

The best upgrade is not always the newest release; it is the newest release that keeps graphics, Wi-Fi, sleep, battery and daily apps reliable. Unsupported Macs depend on OpenCore Legacy Patcher root patches, and each macOS release changes drivers, security policy and graphics behaviour.

Quick Checks

  • Backup current state: Save a copy of your working EFI and run a full system backup before changing settings.
  • Identify hardware components: Note down your exact CPU, GPU, Wi-Fi card, and motherboard/laptop model.
  • Ensure utility alignment: Keep OpenCore, OCLP, and ProperTree updated.

Fix Steps

  1. Create a rollback point: Make a Time Machine backup and keep a copy of your last working EFI folder before editing OpenCore, kexts or root patches.
  2. Match macOS to hardware age: 2011-2012 Macs often behave better on Monterey or Ventura; 2013-2017 Macs can usually test Sonoma or Sequoia with an SSD and enough RAM.
  3. Avoid risky releases for production: Treat macOS Tahoe or any newly unsupported path as experimental until OCLP support is explicit.
  4. Update OCLP first: Install the latest OpenCore Legacy Patcher, build/install OpenCore, then run root patches after macOS boots.
  5. Test the real workload: Check browser tabs, Office/Adobe, printing, sleep, Wi-Fi, Bluetooth and battery before calling the upgrade successful.
  6. Keep a downgrade path: Have a USB installer for the previous stable macOS before upgrading.

Do Not Continue If

  • Do not continue if: you do not have a working EFI backup, a Time Machine backup, or another bootable macOS installer.
  • Stop and capture evidence: if the machine stops booting, take a photo of the last verbose line before changing more settings.

Verify It Worked

  • The machine boots twice without manual intervention.
  • Graphics acceleration and Wi-Fi work after root patches.
  • The user apps that motivated the upgrade actually launch.
  • Battery and thermals are acceptable for the intended workload.

Rollback

  • Restore the previous macOS from Time Machine.
  • Reinstall the older stable release with OCLP.
  • Keep data on a separate backup before experimenting again.

Next Action

  • Test now: reboot twice, reproduce the original problem, and confirm whether the same symptom returns.
  • If it still fails: record the Mac model, macOS build, OpenCore or OCLP version, GPU, Wi-Fi/Bluetooth chipset, and the last visible error.
  • Read next: use the related searches below for the nearest OpenCore or OCLP fix before making another change.

Related iATKOS Searches

Original Question: "NVMe speeds slowing down..?"

Im on a lenovo Thinkpad L13 yoga; Macos Sonoma. The issue im having regarding my NVMe drive is its speed. When I do a blackmagic speed test, it shoots upto 2500 MB/s Read and Write on the first try (5GB stress), but on the next time the write speeds shoot upto 2500 MB/s but suddenly slow down to a final speed of around 70 MB/s. Same issue is happening with my other NVMe and with my other thinkpad too (T480)

Laptops testes on:

L13 yoga gen 1
T480

NVMe's used:

Silicon Power 1TB
Crucial P3 1TB

Any way I can solve this?

submitted by /u/xSpace_Astronomy
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