I have had many people complain about Kaspersky slowing their computer down 100% cpu usage. The reason for it is the Kaspersky launcher, it is terrible and if you look inside of the program it is pretty messy.
There can be times when Kaspersky launcher can use 100s of mb, the computer will feel like it is frozen, also unfortunately you can not shut it down or end the task. ( you can )
Kaspersky there is an old saying that says
IF IT AINT BROKE DONT FIX IT
OR
GIVE IT A KISS Keep-It-Simple-Stupid