Installing Fluent Forms + Formidable Forms in the same website, would it affect loadspeed significantly?

I have some functional needs that would only be satisfied by using both plugins at once (since neither of them has all functionalities I need, but just some/half of these functionalities). I am thinking about installing both plugins instead. I do not mind about incurring in extra costs or about how to integrate both (I am already covered regarding those two issues). What I am concerned about is page loadspeed…..

Do you think having both plugins (which do the same) at once would impact load speed significantly? Would you recommend me to install both given my situation? Would it be worth it?

Also, can pls someone explain me how would they impact load speed? (through adding more js and css, through ajax calls, etc?)

Thank you in advance !!!!