"Like" function using Lambda takes about 3 sec.

My backend developer created Like function with lambda. the problem is that to complete this function it takes up to 3 sec the first time. But the next time I click its much faster, like less than a sec. My backend developer means that its because of Lambdas coldstart .

Question: is there a way to speedup? Can it be the other issue and if so what issue can it be?

thank you!!!!!