OS: Windows 10 version 22H2 (OS Build 19045.3324)
Kaspersky Free 21.14.5.462
Since Kaspersky updated to this version yesterday, I've had this problem with Google in the Firefox browser: there is a 10 to 15 second delay after I hit 'enter', before the search is executed.
I've found a workaround. If I turn off the setting "Inject script into web traffic to interact with web pages" in Network Settings, the problem goes away. Obviously this is not ideal as protection is reduced.