Thorium Browser: Uses up to 87% less RAM than Chrome

Thorium Browser: Uses up to 87% less RAM than Chrome

Executive Summary

Thorium Browser has emerged as a performance-focused alternative in the crowded browser market, promising the minimal UI and performance of raw Chromium, with compiler-level optimization wringing more performance out than Chrome.

Named after radioactive element number 90, this open-source Chromium fork has gained attention for its speed optimizations and broad platform support.

However, its advantages come with important security considerations that users must understand before adoption.

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Key Advantages Over Chrome and Firefox

1. Superior Memory Efficiency

One of Thorium’s most compelling advantages is its dramatically reduced RAM consumption compared to Chrome.

Testing reveals that Thorium used only 81MB to render the same page where Chrome consumed significantly more resources.

In video playback scenarios, Chrome used 433MB during this process. As for Thorium, it used only 197MB which is twice less.

This efficiency makes Thorium particularly attractive for users managing multiple tabs or working on resource-constrained systems.

2. Enhanced Performance Through Compiler Optimizations

Thorium achieves its speed improvements through sophisticated compiler-level modifications.

The browser enables AVX instructions and AES extended instructions when compiled, to speed up the code on CPUs that support them.

Performance testing demonstrates measurable gains, with Speedometer 3.0 benchmark results showing competitive or superior performance compared to mainstream browsers.

These optimizations reportedly deliver a 8-38% performance improvement over vanilla Chromium, depending on the benchmark and OS.

3. Unmatched Platform Compatibility

Unlike Chrome and Firefox, which have limited support for legacy systems, Thorium now supports more OSes and architectures than ANY other browser on the market!.

Windows XP – 11 x32, x64, and arm64. MacOS x64 and arm64. Linux x64 and Raspberry Pi arm64. And Android arm32, arm64, and x86.

This exceptional compatibility makes Thorium valuable for users running older hardware or specialized platforms like Raspberry Pi.

4. Google Ecosystem Integration Without Chrome’s Bloat

Unlike privacy-focused forks such as Ungoogled Chromium, Thorium maintains compatibility with Google account sync.

That means users can still access bookmarks, saved passwords, and history across devices.

This represents a middle ground between stripped-down privacy browsers and resource-heavy Chrome, offering convenience without excessive overhead.

5. Address Firefox Performance Gaps

For users frustrated with Firefox, Firefox seems to have trouble keeping up with the times, as webpages usually load slower and the browser feels less responsive than Chromium-based alternatives.

Thorium’s Chromium foundation provides the modern web compatibility and responsiveness that some users find lacking in Firefox.

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Security Assessment: Critical Considerations

The Security Update Challenge

The most significant concern regarding Thorium is its security update cadence. The Thorium team is much smaller, and it’s usually behind security updates.

At the time of writing, the latest version was almost two months old, making the browser potentially vulnerable to any emerging threats.

This lag creates a critical vulnerability window where Thorium’s builds have been reported to run a few versions behind stable Chromium. This lag means that while users may enjoy performance benefits, they risk being exposed to known security vulnerabilities for longer periods.

Recent reporting indicates 2+ month security lag in some cases, with users potentially exposed to recently patched Chromium exploits. In the fast-moving world of browser security, where zero-day vulnerabilities are frequently discovered, this delay represents a substantial risk.

Developer’s Perspective on Security

The lead developer acknowledges these concerns while providing context. According to release notes,

If you are very concerned about Thorium not always being on the latest Chromium, then perhaps use another browser, or only use Thorium for specific tasks like JPEG-XL or viewing FTP sites.

The developer maintains that I’ve never gotten hacked, or gotten malware while using Thorium daily since 2021, though acknowledging that some zero-day, that they may have patched in a minor revision that Thorium hasn’t been updated to yet, couldn’t leave Thorium more vulnerable than Google Chrome for instance.

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Security Architecture

Despite update delays, Thorium inherits Chromium’s robust security architecture.

The browser implements Address-load randomization (ASLR) on all images in process and other process mitigation policies.

Thorium’s documentation emphasizes that User safety depends on quickly turning around security issues, though the small development team constrains this capability compared to Google’s resources.

The browser also benefits from Chromium’s sandboxing technology, where the renderers are always target processes, unless the –no-sandbox command line has been specified, providing isolation between web content and system resources.

Open Source Transparency

One security advantage is Thorium’s open-source nature. It’s safe to use, and since it’s open source, the community can always check the source code and find anything wrong with the browser.

This transparency allows security researchers to audit the code, though its small user base shows low dedication and development support. This potentially leads to slower bug fixes.

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Platform Availability

Thorium can be installed on:

Windows: Windows XP through Windows 11 (32-bit, 64-bit, and ARM64)
macOS: Intel (x64) and Apple Silicon (ARM64)
Linux: x64 distributions (Ubuntu, Debian, Fedora, and others)
Raspberry Pi: ARM64 support
Android: ARM32, ARM64, and x86 architectures

This comprehensive platform support, particularly for legacy systems, remains unmatched in the browser market.

Download Link in Github

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Practical Recommendations

When Thorium Makes Sense

Thorium is well-suited for:

Users on resource-constrained systems requiring better RAM efficiency
Developers and enthusiasts working with legacy operating systems
Raspberry Pi and specialized hardware deployments
Performance-critical workflows with multiple tabs
Tasks where the security lag risk is acceptable

When to Choose Alternatives

For these scenarios, consider Chrome, Brave, or LibreWolf instead:

Online banking and financial transactions
Healthcare portals and sensitive medical information
Corporate environments with security compliance requirements
Any situation involving confidential or personally identifiable information
Users who require cutting-edge security patches

Hybrid Approach

Many users adopt a dual-browser strategy, using Chrome since it’s much more reliable and maintained, despite its high resource usage for security-sensitive tasks while leveraging Thorium’s performance benefits for general browsing, development work, or resource-intensive applications.

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Conclusion

Thorium Browser delivers genuine performance advantages over Chrome and Firefox, particularly in memory efficiency and platform compatibility. Its compiler optimizations produce measurable speed improvements, and its Google sync integration provides convenience without Chrome’s resource demands.

However, these benefits come with a significant caveat: delayed security updates. For now, Thorium seems best suited for tech enthusiasts and power users eager to experiment with performance gains, rather than for those seeking airtight privacy protections. The browser’s security posture is fundamentally sound, inheriting Chromium’s architecture, but the implementation lag creates an unacceptable risk for sensitive applications.

Ultimately, choosing a browser remains a matter of balancing priorities—speed, privacy, compatibility, or convenience. Thorium excels in one of those areas. Users must evaluate whether performance gains justify accepting temporarily elevated security risks, and should never use Thorium as their sole browser for all activities.

Thorium Browser: Uses up to 87% less RAM than Chrome