I know what you mean. I also own an Phenom II x4 backup system, it's a bit held back by the mobo igpu, but the SSD did wonders. Decent YT, FB, Web, Office etc. performance.
Optimized emulators (ePSXe, PPSSPP...) or 2D emulators would also perform good enough.
Actually i wanted to mention a very a curious situation.
When zen2 cpu's launched, their PassMark single thread score was rated very high, up to 3000 points.
As i checked last time, the zen2 results were lower by a significant ammount, like form 2350 to 2600 points.
The R7 2700x scores 2284 for example.
Benchmarks of the single thread performance of CPUs. This chart comparing CPUs single thread performance is made using thousands of PerformanceTest benchmark results and is updated daily.
Good news is the actual performance wasn't gimped.
CB single threaded score show better performance gains though.
Also SYSMark, for example. Guess it's a combined score and the r5 3600 performs rather good.
About the increased resource usage: the gpu usage looks suspicious also.