Problem when i use kaspersky and email tool

[AmelSchib6]

I currently use this  https : //mailtester.ninja/ as a reference tool for sorting my email lists and recently I have the impression that it is slowing down a bit and that it is becoming slower. Has anyone else had a problem with similar software?

Spoiler

 

Edited May 4 by Berny

[Berny]

@AmelSchib6 Welcome.

7 minutes ago, AmelSchib6 said:

 i use kaspersky

Please provide product and version number ?

[AlexisFSXX]

I personally tested the MailTesterNinja tool after using Hunter.io. 
I find NinjaMail more complete, on the aspects of mail finder and mail checker. In addition, the prices are attractive.