Do parts in ReplicatedStorage affect performance in a game?

I am trying to learn about how to maintain good performance in my games. I am not sure if parts kept in the ReplicatedStorage affect performance, and if any instance takes up memory.

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They can affect the performance a little bit, even though the client (player) cannot see it.

The performance can be slowed down by a small percentage (1% - 5%), but it won’t cause that much lag.

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Thank you! About how many parts/instances would affect 1-5% percent of performance?