Let me tell you a joke
(Please keep in mind that in the last 4 days I'v learnt more about website "security" then I have in the last ~10 years.)
SO the owner said "More plugin's = slow site" & that they must ASK the client IF they want a security plugin... (I wonder if an attacker would be so kind as to ask before taking action?)
I have ~10x plugin's, mainly security based stuff. Using Chrome inspect -> Audit I scored a poor 20/100 .. Some research later I got it to 26/100 lol. Their website score for performance...