Avast Cleanup Premium 21.4 Build 11223 May 2026

This guide covers installation, key features, how to use them, and troubleshooting tips.

Comparison with Competitors (as of 2021)

How does Build 11223 stack up against its peers?

| Feature | Avast Cleanup Premium | CCleaner Professional | Iolo System Mechanic | Glary Utilities Pro | |---------|----------------------|----------------------|----------------------|----------------------| | One-click maintenance | ✅ | ✅ | ✅ | ✅ | | Startup delay | ✅ | ❌ | ✅ | ❌ | | Software updater | ✅ (150+ apps) | ❌ | ✅ (limited) | ✅ (limited) | | Sleep Mode | ✅ | ❌ | ❌ | ❌ | | Registry backup before cleanup | ✅ | ✅ | ✅ | ✅ | | Real-time monitoring | ✅ (free version shows ads) | ❌ | ✅ | ❌ | | Price (annual, 1 PC) | $39.99 | $29.95 | $49.95 | $29.95 | Avast Cleanup Premium 21.4 Build 11223

Verdict: Avast leads in automation (Sleep Mode, delayed startup) and safety features, while CCleaner is lighter but less intelligent. System Mechanic offers deeper tweaks but is more technical.

Performance Benchmarks: Does Build 11223 Actually Work?

To gauge the efficacy of Avast Cleanup Premium 21.4 Build 11223, we tested it on three machines:

1. Legacy Laptop (2015): Intel Celeron, 4GB RAM, 5400RPM HDD, Windows 10.
2. Mid-Range Desktop (2018): Intel i5, 8GB RAM, 256GB SSD, Windows 10.
3. Gaming PC (2020): Ryzen 7, 16GB RAM, 1TB NVMe SSD, Windows 11.

What is Avast Cleanup Premium 21.4 Build 11223?

Avast Cleanup Premium is a system maintenance tool designed to automate the tedious process of cleaning and optimizing a Windows PC. The specific build 21.4.11223 (released in mid-2021) represents a mature iteration of the software, known for being free from some of the early bugs of the 21.x series while introducing refined algorithms for deep cleaning and sleep mode. This guide covers installation, key features, how to

Unlike the free version of Avast Antivirus, this premium tool focuses exclusively on performance—not security. It targets:

• Residual temporary files.
• Registry errors and orphaned entries.
• Resource-hungry background processes.
• Outdated drivers and software.
• Hard drive fragmentation (on HDDs).

2. Sleep Mode (Application Hibernation)

One of the most innovative features in Build 11223 is "Sleep Mode." Unlike traditional uninstallation, Sleep Mode identifies resource-hungry background applications (bloatware, pre-installed manufacturer utilities, rarely used bank security plugins) and puts them to sleep. They remain installed but consume zero CPU or RAM until manually woken. In version 21.4 Build 11223, Avast improved the detection algorithm to ignore critical system processes, preventing accidental crashes.

4. Disk Cleaner & Registry Cleaner

Disk Cleaner goes beyond Windows’ built-in tool by detecting: Comparison with Competitors (as of 2021) How does

• Old Windows Update caches (SoftwareDistribution)
• Temporary setup files (*.tmp, *.log)
• Offline web pages and thumbnail databases

Registry Cleaner is controversial among purists (many claim registry cleaning is snake oil), but Avast takes a cautious approach. It only removes:

• Invalid file associations
• Missing shared DLL references
• Empty registry keys from uninstalled software
• Obsolete startup entries

Crucially, it always prompts to create a system restore point and a full registry backup before any changes. In Build 11223, Avast reduced the number of “high-risk” alerts to less than 2% of detected issues, focusing only on verifiably safe deletions.

Version Specifics: What Does 21.4 Build 11223 Bring?

Version 21.4 Build 11223 is not merely a bug-fix release; it is a snapshot of Avast’s mature optimization philosophy. By this build, Avast had integrated years of user feedback, telemetry, and advancements in Windows kernel handling. Key highlights of this specific build include:

• Enhanced Browser Cleaner – Deep cleaning for Chrome, Firefox, Edge (Chromium), and Opera, including session management and download history without logging users out of critical sites.
• Improved Software Updater – Now detects and updates over 150 common third-party applications (like Java, Adobe Reader, VLC) silently, patching security vulnerabilities.
• Sleep Mode Refinements – Better detection of resource-hungry background processes, with improved "wake-up" reliability for essential services.
• Windows 10 21H1 Compatibility – Full support for the May 2021 Windows update, including proper handling of the new Windows Defender integration.
• Stability Fixes – Resolved rare conflicts with antivirus real-time shields (including non-Avast AVs) and fixed a memory leak in the startup manager.

This build is particularly noteworthy for its reduced false positives—fewer critical system files flagged for deletion—a common pain point in earlier cleanup utilities.