Should You Update Your Mac to macOS Tahoe? What M1 and M2 Users Need to Know First
Should You Update Your Mac to macOS Tahoe? What M1 and M2 Users Need to Know First
macOS Tahoe (macOS 26) was released by Apple on 15 September 2025. It brought a redesigned interface, an improved Spotlight, deeper Apple Intelligence integration, and a range of under-the-hood changes. By June 2026, Apple has shipped six significant updates — the latest being macOS 26.5.1, released on 1 June 2026. The fact that Apple has updated the OS six times in nine months tells you something important: the first few versions had real issues that needed fixing.
This article is not about scaring you away from upgrading. Most of the serious problems have been resolved. It is about helping you make an informed decision and — if you do update — giving you the best chance of a smooth experience.
What Is macOS Tahoe and Where Are We Up To?
macOS Tahoe — also called macOS 26 — is Apple's major 2025 operating system release. It introduced a visual overhaul (curved corners, translucent menus, an updated Control Centre), an expanded Apple Intelligence feature set, and significant improvements to Spotlight search and Shortcuts.
As of June 2026, the current stable version is macOS 26.5.1, released 1 June 2026. If you update now, this is what you will receive — not the original September 2025 release that generated much of the criticism.
What Problems Did M1 and M2 Mac Users Report?
When macOS Tahoe first shipped, a notable number of users running M1-based MacBooks reported problems that were not present under macOS Sonoma or Ventura. These are worth understanding, even though most have since been patched.
Battery Drain
This was the most widely reported issue. Users on M1 MacBook Air models described battery life dropping from the expected 15–18 hours to as little as two to three hours in the first days after installing Tahoe. Elevated background processing — particularly Apple Intelligence indexing and a revamped Spotlight re-indexing the entire drive — was identified as a likely contributor. Apple addressed this directly in macOS 26.1, released in November 2025, and the vast majority of users reported battery life returning to normal levels after that update.
Overheating and Fan Noise
Reports of M1 MacBook Pros running abnormally hot during routine tasks — web browsing, email, general document work — surfaced with both the initial Tahoe release and, more recently, with macOS 26.3.1. Fan noise on normally-silent M1 MacBook Airs drew particular attention. In most cases, the behaviour traced back to background tasks continuing to index and process content for longer than expected. User reports of overheating on M1 MacBook Pro models persist in Apple's own community forums as recently as June 2026, so this is worth monitoring if you run an M1 Pro or Max chip model.
Sluggish UI and Performance
Some M1 Mac users described choppier window animations, slower menu responses, and general sluggishness not present before the upgrade. These complaints were most common in the first two to three weeks post-upgrade, which aligns with the background-indexing explanation. On M2 and M3 Macs, performance issues were far less commonly reported.
Black Screen on Startup and Update Stalls
macOS 26.5, released in May 2026, patched a bug where some Macs started up to a black screen after a software update. Earlier versions also had edge-case startup issues on machines connected to SMB network shares or certain enterprise network extensions.
What Has Apple Fixed?
- macOS 26.1 (November 2025): Restored battery life on MacBook Air and MacBook Pro to expected levels. Addressed the most common M1 performance slowdowns.
- macOS 26.5 (May 2026): Fixed black-screen-on-startup affecting certain models. Resolved unexpected restarts for some MacBook Air and Pro models mounting SMB shares.
- macOS 26.5.1 (1 June 2026): Fixed an unexpected shutdown bug affecting M5 chip Macs connected to certain content-filtering network extensions in enterprise environments.
If you update now in mid-June 2026, you are getting a substantially more stable macOS Tahoe than what shipped in September 2025.
Is macOS Tahoe Compatible with Your Mac?
| Mac Model | Minimum Year | Notes |
|---|---|---|
| MacBook Air | 2020 (M1) | M1 and later |
| MacBook Pro | 2019 | Includes Intel 2019–2020 and all Apple Silicon |
| iMac | 2019 | Intel 2019 and later |
| Mac mini | 2020 (M1) | M1 and later |
| Mac Pro | 2019 | Intel 2019 and later |
| Mac Studio | 2022 | M1 Ultra and later |
Before You Upgrade: A Practical Checklist
If you decide to go ahead, these five steps significantly reduce the risk of problems.
Use Time Machine to a compatible external drive, or verify that a complete, recent backup exists via iCloud or another service. macOS upgrades occasionally fail mid-installation. Without a backup, you have no way to recover. If your Mac has been running slowly or behaving strangely, have the drive assessed before upgrading — upgrading over a degraded SSD is a leading cause of failed installs and data loss.
macOS Tahoe requires approximately 12–15 GB of free space to download and install. Go to Apple menu → About This Mac → Storage and confirm you have enough room. If your drive is nearly full, clear space or have a storage upgrade done before you attempt the install.
Some older software — particularly certain creative, accounting, and business applications — may not have been updated for macOS Tahoe. Check the App Store listing or the developer's website for any application you rely on before upgrading.
Never run a major macOS upgrade on battery alone. Connect the power adapter and leave it connected until the installation is complete and the Mac has restarted cleanly.
After Tahoe installs, your Mac will spend hours re-indexing Spotlight, processing your Photos library, and running other background tasks. Battery life will appear shorter and performance may feel slower for the first one to two days. This is normal and expected — schedule the upgrade for a time when you do not need the Mac at full capacity.
When Should You Wait?
There are legitimate situations where delaying the upgrade makes sense:
- ⚠️ You rely on older software you have not yet confirmed is Tahoe-compatible.
- ⚠️ Your M1 Mac is already showing unusual battery drain or overheating — have it assessed first.
- ⚠️ You are in the middle of a project with a deadline in the next week.
- ⚠️ Your Mac is your only business device with no tested rollback plan.
- ⚠️ Your current macOS is working perfectly — "if it's not broken" is reasonable logic while Sonoma and Ventura still receive security patches.
What to Do If Something Goes Wrong After Updating
Slow performance or overheating in the first 48 hours
Give the Mac time. Leave it plugged in and let background indexing complete. Most users see performance normalise within 24–48 hours.
Persistent battery drain beyond 48 hours
Open Activity Monitor (Applications → Utilities → Activity Monitor), sort by CPU usage, and look for any process consuming an unusually high percentage. If you cannot identify and resolve it, a macOS reinstall — without erasing your data — often resolves persistent post-upgrade performance issues.
Mac won't start after the update
Hold the power button until you see Options appear (Apple Silicon Macs) and use Disk Utility's First Aid to check the drive before attempting anything else. Do not attempt multiple reinstalls without diagnosing the underlying issue first.
Data appears to be missing
Do not panic. Files are almost never actually deleted by a macOS upgrade — they are typically accessible via Time Machine or a backup. Do not overwrite the drive or reinstall the OS before attempting to locate your data.
We're Here If You Need Us
Macrotech Solutions performs Mac diagnostics, macOS reinstalls, SSD assessments, battery replacements, and data recovery for M1, M2, M3, M4, and Intel Mac models — from our workshop at 50 Titan Drive, Carrum Downs.
If your Mac has behaved strangely after a recent update, or if you would like a health check before upgrading, come and see us.
📍 50 Titan Drive, Carrum Downs VIC 3201
🕐 Monday–Friday 10am–5pm | Saturday 10am–2pm
📞 03 8759 1801
We serve customers from Carrum Downs, Frankston, Seaford, Langwarrin, Cranbourne, Lyndhurst, Patterson Lakes, and surrounding southeast Melbourne suburbs.