I just finished testing few runs of K33 and K34 with the build-in MadMax and the results are below. The CPU was snoozing at ~50% avg load so the limiting factor here is the tmp space for sure. I did fstrim in between each test and left the SWAP on during 1st run only while disabling it for remaining tests. During fist run SWAP filled to ~1.5G during P1 and stayed there for remainder of plotting. I used the Gen3 CS3030 2T NVMe with Ext4 (no tweaks) for tmp. This is still A LOT faster than the classic plotter 
Run 1: -k 33 -r 16 -u 256 (swapon); 5804.86 sec (96.7477 min)
Run 2: -k 33 -r 16 -u 256; 5693.85 sec (94.8975 min)
Run 3: -k 33 -r 32 -u 256; 6917.06 sec (115.284 min)
Run 4: -k 33 -r 16 -u 128; 5898.85 sec (98.3142 min)
Run 5: -k 33 -r 16 -v 128; 6014.67 sec (100.244 min)
Run 6: -k 34 -r 16 -u 256; 13574.3 sec (226.238 min)