[pre-release] macOS Tahoe 26.5

[dogansan]

On 5/3/2026 at 9:01 PM, ANTIKO said:

Thank you so much for helping me set up the RX6950XT! Fixed bugs in DSDT - it takes about 8 seconds to load, thanks for the help and hint!

This reminded me one of my issues:  My boot time after I select Tahoe from OC screen , it is taking 50 secs to login fully while it is around 8-10 secs with Sequioa or Sonoma with the same EFI. Any idea is appreciated

[deeveedee]

Very easy incremental update to Tahoe 26.5 (25F71).  With BluetoolFixup.kext temporarily disabled, VoodooHDA.kext 3.3.4 for audio and itlwm for Intel Wi-Fi, the update process couldn't be easier or faster.

 

 

Incremental Update

Spoiler

 

EDIT: Tahoe 26.5 performance on my underpowered HP EliteBook 850 G7 laptop (mobile CPU less powerful than i5-8600) is OUTSTANDING.

Edited May 5 by deeveedee

[deeveedee]

4 hours ago, dogansan said:

it is taking 50 secs to login fully while it is around 8-10 secs with Sequioa or Sonoma with the same EFI. Any idea is appreciated

 

Are you saying that it takes 50 seconds to boot Tahoe and login, or just to login?  50 seconds just to login is long.  If 50 seconds is just login time (not including boot time), check your startup processes. 

 

Tahoe login and overall responsiveness should get better after your Tahoe installation has time to complete in the background after you upgrade.  Here are a few things you can try to improve Tahoe responsiveness:

• System Settings > Accessibility > Display > Reduce Transparency: Enabled
• System Settings > Accessibility > Motion > Reduce Motion: Enabled
• System Settings > Wall Paper: Set a solid color (scroll down to the bottom of Wall Paper settings)

 

If the time your stating is a combination of boot time and login time, don't shutdown - just sleep and wake instead.

 

If you think your EFI needs to be refined, post your EFI.

[ANTIKO]

6 hours ago, dogansan said:

This reminded me one of my issues:  My boot time after I select Tahoe from OC screen , it is taking 50 secs to login fully while it is around 8-10 secs with Sequioa or Sonoma with the same EFI. Any idea is appreciated

In my case, adding the SSD table to FixHPET - Patch out IRQ Conflicts helped me.

[BALDY_MAN]

Z97 hack update went well

[ANTIKO]

Quick upgrade to 25F71

Spoiler

 

[deeveedee]

37 minutes ago, ANTIKO said:

In my case, adding the SSD table to FixHPET - Patch out IRQ Conflicts helped me.

I haven't heard that, but if that is the case, you may also want to try disabling HPET.  Apple stopped enabling HPET beginning with Kabylake.  Once HPET is disabled, fixing HPET is no longer required.

 

EDIT: HPET can usually be disabled with an ACPI patch that sets HPTE = 0 or by setting HPET._STA = 0.

Edited May 5 by deeveedee

[ANTIKO]

Just now, deeveedee said:

I haven't heard that, but if that is the case, you may also want to try disabling HPET.  Apple stopped enabling HPET beginning with Kabylake.  Once HPET is disabled, fixing HPET is no longer required.

 

EDIT: HPET can usually be disabled with an ACPI patch that sets HPTE = 0 or by setting HPET._STA = 0.

It took me a long time to load: from pressing the button to the desktop - about 35 seconds, I added a table - now 8-10 seconds. There is no way to disable HPET in my bios, I will try the patches - thank you.

[deeveedee]

@ANTIKO If you don't figure it out, post your DSDT and I'll give you the ACPI patch.

 

EDIT: You can also look at the ACPI patches in my Open Core EFI attached here.

Edited May 5 by deeveedee

[kaoskinkae]

Perfect in OLD2: AppleHDA.kext + Wifi Intel OCLP (OpenCore Legacy Patcher) 😄 

 

[Vasya Katanyan]

Done. OCLP from the nightly build lzhoang2801 3.0.0. AppleHDA and native Intel Wi-Fi are supported.

[kgp]

28 minutes ago, Vasya Katanyan said:

Done. OCLP from the nightly build lzhoang2801 3.0.0. AppleHDA and native Intel Wi-Fi are supported.

 

May I ask which Intel Wi-Fi chipset you are using? Just to see if I can add another one to the list of supported devices.. 

I assume you are using OCLP 3.0.0 Nightly (amfipassbeta variant) + AirportItlwm.kext (Ventura) + Broadcom spoofing..

Edited May 5 by kgp

[dogansan]

11 hours ago, deeveedee said:

 

Are you saying that it takes 50 seconds to boot Tahoe and login, or just to login?  50 seconds just to login is long.  If 50 seconds is just login time (not including boot time), check your startup processes. 

 

Tahoe login and overall responsiveness should get better after your Tahoe installation has time to complete in the background after you upgrade.  Here are a few things you can try to improve Tahoe responsiveness:

• System Settings > Accessibility > Display > Reduce Transparency: Enabled
• System Settings > Accessibility > Motion > Reduce Motion: Enabled
• System Settings > Wall Paper: Set a solid color (scroll down to the bottom of Wall Paper settings)

 

If the time your stating is a combination of boot time and login time, don't shutdown - just sleep and wake instead.

 

If you think your EFI needs to be refined, post your EFI.

Thanks for the comments. It actually takes 50 secs from clicking the Tahoe icon in Opencore screen to welcome screen of Tahoe, the login time is only 3 to 5 secs with all startup apps like chrome, finder , Outlook etc. 

 

I will be happy if you can have a look and advise your recommendations for fine tuning  of my EFI. https://we.tl/t-BkMs2oKgCkhVpix5 

[MaLd0n]

1 hour ago, dogansan said:

my EFI. https://we.tl/t-BkMs2oKgCkhVpix5 

-Delete old EFI folder and paste new then empty trash. Don't use merge files.
-Don't use Drag and Drop into EFI partition. Use Copy/Paste instead.
-Reset NVRAM one time - with OpenCore use entry "Reset Nvram" / with Clover use F11 key on boot screen.

https://limewire.com/d/zlU9f#f5eqRr1EgP

 

@ANTIKOPost ur EFI folder here

 

[dogansan]

53 minutes ago, MaLd0n said:

-Delete old EFI folder and paste new then empty trash. Don't use merge files.
-Don't use Drag and Drop into EFI partition. Use Copy/Paste instead.
-Reset NVRAM one time - with OpenCore use entry "Reset Nvram" / with Clover use F11 key on boot screen.

https://limewire.com/d/zlU9f#f5eqRr1EgP

 

@ANTIKOPost ur EFI folder here

 

Thanks @Mald0n ,  I tested exactly the way you proposed: downloaded the modified EFI,  removed old EFI folder, copy&pasted new EFI , restarted and reset twice. But it still boots in 50-52 seconds. Any other recommendation is appreciated.

[MaLd0n]

3 minutes ago, dogansan said:

Thanks @Mald0n ,  I tested exactly the way you proposed: downloaded the modified EFI,  removed old EFI folder, copy&pasted new EFI , restarted and reset twice. But it still boots in 50-52 seconds. Any other recommendation is appreciated.

Test this

https://limewire.com/d/sagCg#974hEztFlL

[dogansan]

9 minutes ago, MaLd0n said:

Test this

https://limewire.com/d/sagCg#974hEztFlL

This improved a lot,  reduced from 50-52 seconds to 25 seconds. Still behind 15 secs of Sequioa , but very good. Thank you very much. Please advise which change(s) has improved the boot time so I can adapt to my original EFI, as this EFI does not contain my wi-fi and some other features

[Alpha22]

[Alpha22]

[kgp]

1 hour ago, Alpha22 said:

 

Thanks for the advice, my friend!

 

OCLP is now automatically downloading and installing Kernel Debug Kit 26.5 build 25F71  for macOS 26.5 RC. 

 

 

Modern Audio, modern Wi-Fi and AWDL continue working flawlessly. 👍 

 

Spoiler

 

Spoiler

 

[deeveedee]

@dogansan you could diff the two EFIs with "diff --brief -r EFI EFI-2"

 

• Files EFI/OC/Kexts/USBMap.kext/Contents/Info.plist and EFI-2/OC/Kexts/USBMap.kext/Contents/Info.plist differ

• Files EFI/OC/config.plist and EFI-2/OC/config.plist differ

Looks like the change was in config.plist: SetApfsTrimTimeout

 

EDIT: I'm confused by the SMBIOS change in USBMap.kext.  You might want to check that.  It should be MacPro7,1 to match the SMBIOS configured in your OC config.plist (unless you've decided to use SMBIOS iMacPro1,1 instead).

Edited May 5 by deeveedee

[kgp]

@dogansan,

 

I wouldn’t get lost in further tweaking your EFI. I suggest a simple test: perform a clean install of Tahoe and compare its boot time with your current (productive) system.

My system boots from the 26.5 RC disk in about 10 seconds, while my two Tahoe 26.4.1 production system disks take noticeably longer to boot using the exact same EFI folder.

Simple solution: use sleep/wake instead of repeatedly rebooting the system.

In any case, this whole ongoing discussion is about a difference of less than 30–40 seconds — I personally wouldn’t worry about it at all.

Edited May 5 by kgp

[deeveedee]

4 minutes ago, kgp said:

In any case, this whole ongoing discussion is about a difference of less than 30–40 seconds — I personally wouldn’t worry about it at all.

 

MaLd0n's change reduced boot time by 25 seconds, so I'm glad he asked.

Edited May 5 by deeveedee

[kgp]

2 minutes ago, deeveedee said:

 

MaLd0n's change reduced boot time by 25 seconds, so I'm glad he asked.

 

But he is left without WI-Fi and working OCLP root patches..  😉

Edited May 5 by kgp

[deeveedee]

@kgp Yes - he already indicated that he knows that.  Isn't the important part of the discussion that he received an answer that helped him?