From what you reported in this link, it may be that you have this slowness by checking the pages. but there should be a smarter way to do this analysis faster and not the end user having to pay for this delay because this slowness of 1, 2 or 3 seconds is very annoying, since I open and browse several pages for a long time every day. I've already used ESET Smart Security, which also has several security and page verification modules, but the product doesn't slow down, like Kaspersky's.
Does Kaspersky use something that is more secure than other products to be worth slowing down?