well it depends which i5 you have, bc if you have an old i5 that's probably the reason youre lagging and not the core count
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You need to look at the individual processor and not focus so much on the i7 or i5 moniker. Which specific i5 or i7 - and what generation they are from ALL make a huge difference. There are many different i5s. Just like there are many different i7s.
Would you be able to please posting your system specs to help with guidance. Click start > type MSinfo > open the system information app in the results > click edit at the top left, select all, copy, paste results here. In addition, what brand model of storage drive are you currently using for your c drive?
It's worth starting off with an /sfc scannkw and a chkdsk first as that might help. Also, if it's a HDD then a disc defrag could also help. Once we know your specs then that can be considered too.
Better try to update memory (RAM) also go with ssd if itβs capable
Sounds like ram problems not cpu