Ok - assuming, as implied, that speedtest results aren’t real. Steam application downloads are: I’ve downloaded ARMA3 4 times. Procedure - configure av software, launch steam, download application, record results, delete steam downloading and arma3 folder, repeast Attached photo shows steam downloads under the following conditions: NO AV software installed Kaspersky Secure Cloud Free - protection enabled Kaspersky Secure Cloud Free -protection disabled Other AV software protection enabled Results: No av software installed, 99.5MB/s current 100.5MB/s peak (800Mbits/second) Kaspersky SC protection enabled, 44.1 MB/s cur 46.3MB/s peak (370 Mbit/second) Kaspersky SC protection disabled 59.3 MB/s cur, 59.9 MB/s peak (479.2 Mbit/second) Other AV Protection Enabled 57.0 MB/s current, 59.1 MB/s peak( 472.8 Mbit/second) My questions: Why does having Kaspersky SC installed result in a 40-60% loss in throughput, EVEN when Protection is disabled. I think it’s reasonable to assume that AV software has overhead, HOWEVER it’s also reasonable to assume that disabling protection would offset the performance tax. Why is there still a high degree of overhead when disabled? Does Kaspersky publish maximum throughput numbers? Why Not? Being transparent about maximum throughput as tested in Kaspersky’s labs would alleviate Kaspersky’s support requests. I read the link tl;dr Download over 100MB Open support case with screen caps.