Antivirus software can significantly impact your computer’s performance. Some antivirus solutions are so lightweight you won’t notice them running, while others can make even powerful PCs feel sluggish. Here’s our 2025 performance comparison.

Fastest Antivirus (Lowest Impact)

1. Webroot SecureAnywhere – Nearly zero impact, cloud-based (9.5/10)
2. ESET NOD32 – Extremely lightweight, fast scans (9.2/10)
3. Bitdefender – Impressive performance for feature count (9.0/10)
4. Windows Defender – Very light, integrated with OS (8.8/10)

Heavier Antivirus (Higher Impact)

• McAfee Total Protection – Noticeable impact on older hardware
• Trend Micro Maximum Security – Can slow full scans
• Panda Dome – Variable impact depending on feature usage

Tips to Minimize Performance Impact

• Use “Gaming Mode” or “Silent Mode”
• Schedule full scans during idle time
• Use quick scans daily, full scans weekly
• Consider Webroot or ESET for older PCs