Because any security suite that inserts itself between the web and browser will incur overhead as it examines content and more.
This is like a security guard at the gate checking each car or such.
Another AV might be faster by a smidge or if you tell it to "ignore the web" then you get no security?
-> How about my choice of security for web browsing?
1. Firefox or Chrome (sorry IE/Edge.)
2. Web Of Trust (WOT) and AdBlock+
It's simply effective and well if you decide to go to bad places, who's to blame?
First I had Bitdefender Total Security and noticed that it slows down my Chrome browser. Then I uninstalled it and installed Nod32 ESS. Same problem again. It slows down google chrome.
Is there a way to fix this without compromising my security besides installing some other AV?