BEFORE LOADING m6sparse

(("destructuring" (cl-destructuring-bind "FASTEST" 0.010702393 0 0.0)
  (pcase-let "1.3x SLOWER" 0.014360937999999998 0 0.0)
  (seq-let "3.5x (rel 2.6x) SLOWER" 0.03706726 0 0.0))
 ("\"some\" operation, small lists"
  (cl-some "FASTEST" 0.034695811 0 0.0)
  (seq-some "3.9x SLOWER" 0.135977155 10 0.0755767589999996))
 ("\"some\" operation, big lists"
  (cl-some "FASTEST" 0.29491865700000003 0 0.0)
  (seq-some "1.5x SLOWER" 0.44417032 0 0.0))
 ("set difference, small lists, custom pred"
  (cl-nset-difference "FASTEST" 0.19550686 15 0.11099579500000001)
  (cl-set-difference "5.1x SLOWER" 1.000326248 39 0.2885333050000005)
  (seq-difference-3 "13.2x (rel 2.6x) SLOWER" 2.575436995 192
		    1.4284019790000002)
  (seq-difference "14.4x (rel 1.1x) SLOWER" 2.8172440610000002 212
		  1.5752595139999999))
 ("set difference, big lists, custom pred"
  (cl-nset-difference "FASTEST" 0.011390392 0 0.0)
  (cl-set-difference "5.5x SLOWER" 0.062250377999999995 1
		     0.007866447000000054)
  (seq-difference-3 "15.9x (rel 2.9x) SLOWER" 0.18127607499999998 12
		    0.09376674499999993)
  (seq-difference "19.0x (rel 1.2x) SLOWER" 0.21642625100000001 15
		  0.1219803650000002))
 ("set difference, small lists, #'eql pred"
  (cl-nset-difference "FASTEST" 0.025416642 0 0.0)
  (cl-set-difference "10.6x SLOWER" 0.268309301 24 0.17514854700000004)
  (seq-difference-3 "19.3x (rel 1.8x) SLOWER" 0.491795223 47
		    0.3400537589999999)
  (seq-difference "101.8x (rel 5.3x) SLOWER" 2.5877423690000003 212
		  1.5652519980000001))
 ("set difference, big lists, #'eql pred"
  (cl-nset-difference "FASTEST" 0.001086087 0 0.0)
  (cl-set-difference "31.2x SLOWER" 0.033846905999999996 3
		     0.022589776999999867)
  (seq-difference-3 "38.0x (rel 1.2x) SLOWER" 0.041256314 3
		    0.024156587999999868)
  (seq-difference "363.2x (rel 9.6x) SLOWER" 0.39448685299999997 30
		  0.24322218400000017))
 ("set difference, small lists, #'equal pred"
  (joaot/handrolled-nset-difference "FASTEST" 0.015404288 0 0.0)
  (cl-nset-difference "3.9x SLOWER" 0.060033165 4 0.027628342)
  (dmitry/set-difference-nocons "7.8x (rel 2.0x) SLOWER" 0.120780652 0
				0.0)
  (cl-set-difference "23.6x (rel 3.0x) SLOWER" 0.362814037 28
		     0.201481361)
  (seq-difference-3 "36.5x (rel 1.6x) SLOWER" 0.5629666289999999 47
		    0.33870848)
  (seq-difference "48.9x (rel 1.3x) SLOWER" 0.753127336 68
		  0.47948227499999996))
 ("set difference, big lists, #'equal pred"
  (joaot/handrolled-nset-difference "FASTEST" 0.002013658 0 0.0)
  (cl-nset-difference "1.7x SLOWER" 0.0033535120000000003 0 0.0)
  (dmitry/set-difference-nocons "8.1x (rel 4.9x) SLOWER" 0.016377504 0
				0.0)
  (cl-set-difference "21.6x (rel 2.7x) SLOWER" 0.043477418 3
		     0.021467216000000004)
  (seq-difference-3 "25.2x (rel 1.2x) SLOWER" 0.050788065 3
		    0.022892674000000002)
  (seq-difference "39.0x (rel 1.5x) SLOWER" 0.07861690199999999 6
		  0.04483213700000001)))

AFTER loading it

(("destructuring" (cl-destructuring-bind "FASTEST" 0.010157632 0 0.0)
  (pcase-let "1.3x SLOWER" 0.013152518000000002 0 0.0)
  (seq-let "14.8x (rel 11.4x) SLOWER" 0.15057331499999999
    6 0.04785139399999849))
 ("\"some\" operation, small lists"
  (cl-some "FASTEST" 0.030627893999999996 0 0.0)
  (seq-some "5.1x SLOWER" 0.156528706 10 0.08218940500000116))
 ("\"some\" operation, big lists"
  (cl-some "FASTEST" 0.253589884 0 0.0)
  (seq-some "1.7x SLOWER" 0.42605076199999997 0 0.0))
 ("set difference, small lists, custom pred"
  (cl-nset-difference "FASTEST" 0.201229483 15 0.11990391199999983)
  (cl-set-difference "5.0x SLOWER" 1.002034638 39 0.31673883500000066)
  (seq-difference-3 "15.6x (rel 3.1x) SLOWER" 3.136544874 194
		    1.7686539850000003)
  (seq-difference "18.9x (rel 1.2x) SLOWER" 3.795912411 260
		  2.140581182000002))
 ("set difference, big lists, custom pred"
  (cl-nset-difference "FASTEST" 0.011600632 0 0.0)
  (cl-set-difference "5.4x SLOWER" 0.062588482 1 0.008457714000000394)
  (seq-difference-3 "18.1x (rel 3.4x) SLOWER" 0.21003662699999998 12
		    0.10525734000000142)
  (seq-difference "25.5x (rel 1.4x) SLOWER" 0.29535328699999996 19
		  0.16559472099999972))
 ("set difference, small lists, #'eql pred"
  (cl-nset-difference "FASTEST" 0.023517136 0 0.0)
  (cl-set-difference "11.5x SLOWER" 0.271050456 24 0.18550450299999888)
  (seq-difference-3 "24.1x (rel 2.1x) SLOWER" 0.567758752 50
		    0.39358252499999935)
  (seq-difference "148.5x (rel 6.1x) SLOWER" 3.491236757 260
		  2.072315871999999))
 ("set difference, big lists, #'eql pred"
  (cl-nset-difference "FASTEST" 0.0010804710000000002 0 0.0)
  (cl-set-difference "33.0x SLOWER" 0.035650159 3 0.024719922999999255)
  (seq-difference-3 "39.0x (rel 1.2x) SLOWER" 0.042105057 3
		    0.025471970999999982)
  (seq-difference "520.3x (rel 13.4x) SLOWER" 0.5621415289999999 39
		  0.34187674300000026))
 ("set difference, small lists, #'equal pred"
  (joaot/handrolled-nset-difference "FASTEST" 0.014848083 0 0.0)
  (cl-nset-difference "4.4x SLOWER" 0.064930546 4 0.03191499300000089)
  (dmitry/set-difference-nocons "8.2x (rel 1.9x) SLOWER"
				0.12118037799999999 0 0.0)
  (cl-set-difference "25.4x (rel 3.1x) SLOWER" 0.377759915 28
		     0.22155792999999946)
  (seq-difference-3 "42.5x (rel 1.7x) SLOWER" 0.630364124 50
		    0.3947469649999995)
  (seq-difference "93.6x (rel 2.2x) SLOWER" 1.390502927 116
		  0.9019907159999985))
 ("set difference, big lists, #'equal pred"
  (cl-nset-difference "FASTEST" 0.002104955 0 0.0)
  (joaot/handrolled-nset-difference "1.2x SLOWER" 0.002503964 0 0.0)
  (dmitry/set-difference-nocons "7.9x (rel 6.6x) SLOWER"
				0.016558740000000002 0 0.0)
  (cl-set-difference "22.2x (rel 2.8x) SLOWER" 0.046786407 3
		     0.02427869799999982)
  (seq-difference-3 "26.0x (rel 1.2x) SLOWER" 0.054804263 3
		    0.02563775999999862)
  (seq-difference "93.5x (rel 3.6x) SLOWER" 0.196867405 15
		  0.12648469499999848)))