I have been a long time user of Eset NOD32 Antivirus and Eset Smart Security but have recently switched to Kaspersky Internet Security. I love the added security in KIS but felt my system becamse much slower especially when launching new setup files. It seems that KIS is trying to check the file against its definitions and against the Kaspersky Security Network (Cloud Protection) but this is awfully slow! It takes me around 15-20 seconds to launch EXE files. This doesn't happen with the well known programs but happens mostly with new programs that are probably new KIS! It takes me for example 30 seconds to launch the Freemake Video Converter setup file while I am running on an SSD for god's sake on a high end Notebook (check sig for specs) With that said, this time I decided to do something different. While installing KIS, I unchecked the box which enables you to participate in the Kaspersky Security Network by sending info about your programs to Kaspersky. Wow! That made a night and day difference! It's like I bought a new computer! My system is much snappier now and programs and program installations load much faster. If you have the option to send info about your Programs/System to the Kaspersky Network (which you probably do since that is the default installation method), then simply bring up the Main KIS window, then click on Settings, then follow the steps in the illustration below.