Does NFT Smart Contracts needs to be seperate of each user who connects wallet and deploys smart contract for the first time of wallet connection? or it is the single smart contract remain for all user who connects wallet and mint thier nfts thier into a single only one time deployed smart contract. i have this question because i think single smart contract if used then if no of users as increased by the passage of time. it keeps nfts minting slow eventually. and asks higher feee because of load increases in the smart contract. does this thinking is a myth of my mind of really exist?

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