I have tried a few free antivirus softwares which may be effective catching viruses but for heaven's sake they slow down the computer to a ridiculous crawl. I am still willing to try some more, but I wonder if anyone here can recommend a few AV that do not slow down the computer to a noticeable level. Some of the ones I remember using for a while have been: Avast, AVG, Bit Defender, Immunet, Kaspersky, Norton, Trend Micro. Please tell me of your experiences. Thanks.