Mac is not working properly
when I turn on my iMac it takes time to start about 5 mints even more and after start also still I can not work because its look like hacked I can not work or go setting even its update I update the last software version but still not working propely I need to assist what should I do I bought this iMac for the Second hand and computer is also free it mean I did not add anything that make it slow please let me know what shall I do what's the reason .Thanks for your supports
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iMac 21.5″, macOS 14.5