Quick decision
Looking for the lightest antivirus that won't slow things down
Your machine slows down with heavy security software running. You need real protection without the performance cost — whether it's an old PC, a gaming rig, or just a machine you care about staying fast.
ESET has the lowest consistent performance impact in independent tests while maintaining strong detection. Avira is a lighter free alternative if cost is also a constraint.
ESETFits if you want minimal resource usage with top-tier detection. Gaming mode pauses scans automatically. The technical answer to this question.
Go to ESET →
AviraMakes more sense if you want a free, lighter option with real-time protection. Not as lean as ESET but significantly lighter than suite-heavy products.
Go to Avira →NoteIf the machine is slow and also showing strange behavior — redirects, unexpected popups — the cause may be malware, not your AV. Run a Malwarebytes scan first to rule that out.
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