Haswell and older will see more-significant slowdowns, Skylake and newer will see less-significant slowdowns... what about Broadwell? I have a 6850k.
Microsoft claims CPUs post 2015 only have unnoticable slowdown.
FTFY
it could do with a pcie sdd and maybe a gpu upgrade but it's still perfectly serviceable. the only thing that has failed is the motherboard (was able to replace that for 110 AUD) and the CPU fan (i bought the wrong one and burned the bearings out because it was for lower TDP cpus).