Why is Microsoft Windows 11 such a poorly optimized operating system (OS)?

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Why is Microsoft Windows 11 such a poorly optimized operating system (OS)?

Why is “Microsoft Windows 11” considered a poorly optimized operating system?

The debut of “Windows 11” at the end of 2021 was accompanied by ambitious promises of a new design language, improved productivity, and gaming performance. However, several years later, criticism regarding the system’s slowness, resource wastage, and questionable design decisions still resonates within user and expert communities.

In this article, we will thoroughly examine the technical and structural reasons why “Windows 11” is often referred to as “heavy” and poorly optimized.

1. Code Layering and Legacy Code

One of the biggest issues with “Windows 11” is the so-called legacy code. “Microsoft” has never rewritten its operating system “from scratch.” Instead, each new version is built on previous foundations to maintain compatibility with decades-old software.

Interface Fragmentation

“Windows 11” aims to present a modern Fluent Design visual, but underneath it still lies elements from “Windows 10,” “Windows 7,” and even “Windows 95” (for example, some deeply hidden control panel menus). This results in UI overhead – the system has to load multiple different graphic engines and libraries simultaneously to render a visually cohesive image. This requires additional RAM and CPU resources.

2. Virtualization-Based Security (VBS) and Performance Cost

“Windows 11” introduced strict hardware requirements, including a TPM 2.0 module. The main reason for this is Virtualization-Based Security (VBS).

While VBS significantly increases the system’s resistance to malware by isolating a secure memory portion from the rest of the OS, it directly impacts performance. Academic and technological research (e.g., V. G. Ferreira et al., 2022) shows that enabled VBS can reduce gaming and heavy application performance by 5% to 25%, depending on the processor generation. This is particularly noticeable on processors that lack specific hardware acceleration features to manage this function.

3. Bloatware and Background Processes

The modern “Windows 11” installation is overloaded with unnecessary programs and telemetry processes.

  • Telemetry: “Microsoft” collects vast amounts of data about user behavior. Background services constantly use network and CPU resources to process and send this data.
  • Web-based elements: Many new “Windows 11” features, such as the Widgets panel or the new “Outlook” app, are actually websites based on WebView2 (Edge/Chromium). They consume RAM as greedily as open browser tabs, even if the user is not using them.

4. Context Menu and Explorer.exe Instability

Users often notice latency when right-clicking or navigating the file explorer.

  • Context Menu: The new menu is created using the WinUI 3 framework. The problem is that the system first tries to load this modern layer, and if the user clicks “Show more options,” the old “Win32” menu must be invoked. This switching causes noticeable animation stuttering.
  • File Explorer Memory Leak: Since its release, “Windows 11” File Explorer has suffered from bugs where RAM resources are not fully released after closing windows. Although “Microsoft” has released several patches, the system’s “Explorer.exe” architecture remains one of the least optimized parts of the OS.

5. Hybrid Architecture and Thread Director

“Windows 11” was designed specifically for newer processors with hybrid core architecture (e.g., “Intel Alder Lake” and newer, featuring P-cores and E-cores).

While the Windows Scheduler performs better in 2026 than at the OS’s launch, it still sometimes misallocates processes. For example, a heavy task may be sent to a weaker E-core (efficiency core), while a background process may unnecessarily “wake up” a powerful P-core, thus increasing power consumption and reducing overall system smoothness.

Conclusions

“Windows 11” is not a “bad” operating system in terms of security or features, but its optimization sacrifices smoothness for three things:

  • Backward compatibility with old code.
  • Strict security architecture (VBS).
  • Aggressive data collection and integration of “Microsoft” services.

For most users, “Windows 11” feels slow not because their computer is weak, but because the OS architecture is overloaded with layers that constantly compete for the same resources.

Sources and Recommended Literature:

  • Ferreira, V. G., et al. (2022). The Performance Impact of Virtualization-Based Security on Modern Operating Systems. Journal of Systems Architecture. (Access via Google Scholar).
  • Microsoft Learn (2025). Windows 11 Architecture and Subsystem for Linux: Optimization Guidelines. (Official technical documentation).
  • Neowin Tech Analysis (2026). The Bloatware Problem: Why Windows 11 system requirements keep climbing.
  • Tanenbaum, A. S., & Bos, H. (2023). Modern Operating Systems (5th Edition). (Academic guide on OS architecture and resource management).
  • Benchmarking Report (2025). Impact of WinUI 3 on Shell Performance in Windows 11. (Performance research report).

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