Newer macOS runs slower on Intel (undeniably) – on purpose or "accident"?

When considering the perceived slowdown of newer macOS versions on Intel-based systems, it's essential to understand that this is largely a side effect of Apple's strategic shift to Apple Silicon, rather than an intentional act of sabotage.

The Core Reason: Strategic Transition to Apple Silicon

Apple's deliberate focus on optimizing macOS for its proprietary Apple Silicon architecture (M1, M2, etc.) is the primary driver behind the performance discrepancies. As the company invests heavily in its own chips, its engineering resources are naturally directed towards leveraging the unique capabilities of Apple Silicon. This means that features, compiler optimizations, and driver work are primarily built for ARM, leaving the Intel code path in a maintenance-only mode with less attention to new optimizations.

Factors Contributing to Observed Slowdown on Intel

1. ·

   Shift of Engineering Resources: Apple's public roadmap and developer documentation consistently emphasize "Apple Silicon first." New APIs (like Metal 3, SwiftUI 4) and compiler toolchains (Swift, Clang) are aggressively optimized for ARM64, and these optimizations are not backported to x86-64. This leads to new code paths being tuned for ARM, while Intel paths receive fewer updates and optimizations.

2. ·

   Kernel and Subsystem Changes: Later macOS versions (e.g., macOS 12+) introduced a new kernel architecture heavily reliant on Apple's specific hardware abstraction layer. Intel Macs often rely on older x86 kernels that lack modern scheduling and power-management improvements. Key subsystems (e.g., Metal GPU driver, FileVault, Secure Enclave) have been rewritten for ARM, forcing Intel Macs to use less efficient, legacy drivers.

3. ·

   Hardware Limitations and Demands: Newer macOS features inherently require more processing power and specialized hardware capabilities found in Apple Silicon. As Apple designs features with its powerful and efficient chips in mind, older Intel hardware may simply not keep pace, leading to performance compromises.

4. ·

   Binary Optimization: While Rosetta 2 allows Apple Silicon to run Intel apps, the reverse — running ARM-only binaries on Intel — does not exist. Many newer Apple-first applications (Safari, Mail, Photos) ship as universal binaries, but the Intel slice is often an older, less optimized build that receives fewer updates compared to its ARM counterpart.

5. ·

   Firmware and Security: Apple has largely discontinued firmware updates for Intel Macs post-macOS 12. New security features (Secure Boot, runtime kernel integrity) are often implemented in hardware on Apple Silicon, requiring software workarounds with added overhead on Intel.

6. ·

   Economic Incentives: By allowing Intel performance to naturally degrade due to deprioritization, Apple creates an incentive for users to upgrade to newer Apple Silicon hardware, thereby fueling the transition and associated ecosystem.

Is it Intentional Sabotage?

No. The consensus is that there is no evidence of a covert "performance-kill" mechanism or deliberate throttling. The slowdown is a by-product of strategic deprioritization and a natural consequence of Apple no longer actively investing in optimizing for the Intel architecture. If Apple intended to cripple Intel Macs, it could have implemented kernel-level throttles or removed critical drivers. Instead, Intel Macs simply don't receive the same level of optimization as their Apple Silicon counterparts.

What Users Can Do

For users experiencing slowdowns on Intel Macs, here are some recommendations:

• ·Stay on an older, Intel-optimized macOS version: Maintaining versions like Catalina or Big Sur can preserve performance, though you'll miss out on security updates and new features.
• ·Upgrade Hardware: The most effective solution is to transition to an Apple Silicon Mac, which offers immediate performance boosts and longer software support.
• ·Performance Management: Disable visual effects (reduce transparency, motion) and manage login items. Monitor resource usage with Activity Monitor to identify resource-intensive processes.
• ·Check for Third-Party Tools: While yielding minor gains, some advanced users might explore community-driven patches or brew-compiled binaries.

In essence, the decline in performance on newer macOS versions on Intel Macs is a clear indicator of Apple's forward-looking strategy and its commitment to its own silicon, rather than a malicious act against its older user base.