![]() Two of them, Bitdefender Total Security and Kaspersky Total Security, had relatively high post-installation background system impacts, of 19% and 12%, respectively, yet traded that for fairly light impacts - 33% and 26% - during system scans. It's hard to determine a second place among the paid programs. But Avast's full-scan slowdown was the heaviest at 53%, while AVG's was less than half that at 25%. Likewise, Avast Free Antivirus (4.4%) had less of a background impact than its sibling AVG AntiVirus Free, (5.2%). You wouldn't notice ESET's 12% hit unless you were intensively using the processor already. You'd probably notice that full-scan slowdown even if you were just checking email. But McAfee's full scan hit our test laptop like a ton of bricks, slowing it down by 96%. For example, McAfee Total Protection had a relatively light background impact, slowing down the Lenovo laptop by only 9% after installation. Most other programs were less consistent in their rankings. Kaspersky Security Cloud Free's full-scan system impact was a barely noticeable 6% its quick-scan impact was a barely measurable 1%. It actually sped up the system a bit after installation, indicating that it may be more efficient than the built-in Microsoft Defender Antivirus, which runs by default but deactivates itself if a third-party antivirus program is installed. Kaspersky Security Cloud Free was the undisputed winner in the free categories, beating all rivals in passive, full-scan and quick-scan impacts. ![]() Kaspersky did have the second-lightest full-scan impact in the bunch, however. The lightest quick-scan impact among paid programs was held by Kaspersky Total Security at 22%, a percentage that was nearly twice as much as ESET's full-scan impact. ![]() That may be because ESET doesn't have a quick-scan option. Among paid antivirus programs, ESET was not the fastest in all three categories that we measured: passive system impact, full-scan system impact and quick-scan system impact. ![]()
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