Advice on buying a new PC (and O/S) primarily to run Quartus and Modelsim - thanks!

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What wersion of Quartus are you using? Is it Lite, Standart or PRO?

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For this test I used Xilinx Vivado 2017.1, not Quartus. But Quartus (Pro/Standard) with other tests behaves very likeliy like Xilinx.

As I see, synthesis and report/timing analysis can use multicore. While fitting/placement mostly one thread/core is used. Its sad, but its true.

My rule of thumb for FPGA development is "think, simulate, think, pause, think, simulate, think while synthesis" ;-)