1. v4 / master, same method (median time ratio; 1.00 = no change)
   corpus size op | pglz | lz4 | round-to-round spread of master (pglz, lz4)
   docs 4000 load | 1.00 | 0.99 | 1.00, 1.00
   docs 4000 read_all | 1.00 | 1.01 | 1.00, 1.00
   docs 4000 slice | 1.00 | 1.02 | 1.01, 1.01
   docs 4000 prefix | 1.02 | 1.03 | 1.00, 1.00
   docs 32000 load | 1.00 | 1.03 | 1.00, 1.01
   docs 32000 read_all | 0.99 | 1.03 | 1.03, 1.00
   docs 32000 slice | 1.00 | 1.04 | 1.00, 1.02
   docs 32000 prefix | 1.05 | 1.03 | 1.05, 1.00
   docs 1000000 load | 1.00 | 1.01 | 1.00, 1.01
   docs 1000000 read_all | 1.01 | 1.00 | 1.01, 1.00
   docs 1000000 slice | 1.00 | 1.01 | 1.01, 1.03
   docs 1000000 prefix | 1.00 | 0.96 | 1.00, 1.04
   json 4000 load | 1.01 | 1.02 | 1.01, 1.02
   json 4000 read_all | 1.02 | 1.02 | 1.02, 1.02
   json 4000 slice | 1.00 | 1.02 | 1.00, 1.00
   json 4000 prefix | 1.04 | 1.00 | 1.04, 1.00
   json 32000 load | 1.01 | 1.05 | 1.00, 1.03
   json 32000 read_all | 1.01 | 1.04 | 1.00, 1.00
   json 32000 slice | 1.03 | 1.06 | 1.00, 1.00
   json 32000 prefix | 1.00 | 1.08 | 1.05, 1.00
   json 1000000 load | 1.00 | 0.99 | 1.00, 1.01
   json 1000000 read_all | 1.00 | 1.00 | 1.00, 1.01
   json 1000000 slice | 0.98 | 0.98 | 1.04, 1.00
   json 1000000 prefix | 1.00 | 1.00 | 1.00, 1.00
   random 4000 load | 1.02 | 1.02 | 1.02, 1.03
   random 4000 read_all | 1.03 | 1.12 | 1.01, 1.02
   random 4000 slice | 1.02 | 1.06 | 1.01, 1.02
   random 4000 prefix | 1.03 | 1.02 | 1.01, 1.02
   random 32000 load | 1.01 | 1.11 | 1.00, 1.02
   random 32000 read_all | 1.00 | 0.99 | 1.02, 1.02
   random 32000 slice | 1.00 | 1.00 | 1.00, 1.04
   random 32000 prefix | 1.00 | 1.02 | 1.04, 1.08
   random 1000000 load | 1.05 | 1.00 | 1.03, 1.02
   random 1000000 read_all | 0.99 | 0.98 | 1.01, 1.02
   random 1000000 slice | 1.00 | 1.00 | 1.00, 1.00
   random 1000000 prefix | 1.05 | 1.00 | 1.10, 1.00

2. Methods on v4: stored size (% of raw), then median ms per operation
   corpus size | pglz | lz4 | zstd
   docs 4000 stored | 48.2% | 57.4% | 36.3%
   docs 4000 load ms | 1683 | 540 | 854
   docs 4000 read_all ms | 224 | 105 | 228
   docs 4000 slice ms | 140 | 88 | 227
   docs 4000 prefix ms | 42 | 62 | 227
   docs 32000 stored | 35.7% | 41.0% | 26.9%
   docs 32000 load ms | 2030 | 390 | 592
   docs 32000 read_all ms | 196 | 76 | 146
   docs 32000 slice ms | 120 | 57 | 172
   docs 32000 prefix ms | 22 | 34 | 168
   docs 1000000 stored | 30.8% | 32.8% | 21.0%
   docs 1000000 load ms | 2028 | 384 | 556
   docs 1000000 read_all ms | 234 | 101 | 142
   docs 1000000 slice ms | 103 | 38 | 59
   docs 1000000 prefix ms | 11 | 23 | 29
   json 4000 stored | 18.6% | 29.3% | 13.7%
   json 4000 load ms | 798 | 278 | 445
   json 4000 read_all ms | 57 | 53 | 140
   json 4000 slice ms | 44 | 43 | 142
   json 4000 prefix ms | 24 | 23 | 140
   json 32000 stored | 13.0% | 25.8% | 8.7%
   json 32000 load ms | 814 | 200 | 248
   json 32000 read_all ms | 46 | 49 | 81
   json 32000 slice ms | 34 | 38 | 122
   json 32000 prefix ms | 19 | 27 | 111
   json 1000000 stored | 12.1% | 18.0% | 4.6%
   json 1000000 load ms | 792 | 192 | 213
   json 1000000 read_all ms | 78 | 78 | 94
   json 1000000 slice ms | 26 | 26 | 35
   json 1000000 prefix ms | 10 | 17 | 18
   random 4000 stored | 137.8% | 137.8% | 78.1%
   random 4000 load ms | 1026 | 510 | 711
   random 4000 read_all ms | 105 | 116 | 223
   random 4000 slice ms | 86 | 91 | 225
   random 4000 prefix ms | 84 | 86 | 223
   random 32000 stored | 102.9% | 102.9% | 77.0%
   random 32000 load ms | 1394 | 366 | 370
   random 32000 read_all ms | 56 | 56 | 140
   random 32000 slice ms | 25 | 26 | 167
   random 32000 prefix ms | 25 | 26 | 165
   random 1000000 stored | 102.8% | 102.8% | 73.7%
   random 1000000 load ms | 1504 | 290 | 499
   random 1000000 read_all ms | 89 | 88 | 168
   random 1000000 slice ms | 11 | 11 | 113
   random 1000000 prefix ms | 11 | 11 | 48