I m guessing the main thing to upgrade here would be the CPU because the SSD is a brand new one. I m running it on a i5 6500 but you are right the bigger the blockchain/blocksize gets the longer it would take you to validate all of it.
Thinking more about this. Have you tried connecting the machine directly to the home router? Wifi can be a bottleneck.
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Well I use a extender but yes its connected through ethernet. Wifi would only get me about 100MB/s
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Your bandwidth and cache allocated in the bitcoin.conf might also be a factor.
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Hope I can get some more out of that, will look into it.
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