i recommend you install a SSD and install your operating system on it
i hear the samsung 980 is one of the fastest on the market within a reasonable price range
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Do you get the same behavior on both wifi and wired? What about using a phone hotspot? That would isolate the issue between the wireless NIC, the wired NIC, or your current internet.
try setting the high and medium impact programs to disabled in startup then uninstall any programs you dont use
also do a internet speed test and post results