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Upgrade installation running phones slower

I have been using Samsung phones for last 7 years. I have consistently seen the phone getting slower as soon as I install the upgrade. Just recently, Samsung had sent me an upgrade for my Samsung note 8, and I have clearly observed that many features have considerably slowed down. Upgrades are supposed to improve the phones quality or features. Can I know Samsung, why can't I observe the improvements but in fact slowing my phone down.