I want to share my experience of using a few antivirus on my system and their performance impact. I am not talking about protection or features , just the performance. I have an i5 6600 , 16 GB ram , Samsung 850 250 GB evo SSD on Win 10 Enterprise LTSB. Eset all 3 versions - No impact Panda Free - No impact Avira Free - Very long boot time , after that minimal impact Emsisoft AV/IS - Lighter than avira , heavier than eset and panda , no boot impact Avast Free - No boot impact, but a noticeable impact on opening apps Kaspersky AV/IS - Heavier than emsisoft , lighter than avast , a little impact on boot Sophos Home - Heavier than kaspersky , a small boot impact WD - A noticeable impact on everything , from boot to opening of apps Please note that these are my observations on my system , ymmv . What are your observations on your system with SSD ?