Performance comparison of Dario Alpern's SIQS, PSIQS and Yafu 1.34.5 Win64 ========================================================================== Test platform: i7-2630QM notebook with 16 GB RAM, no SSD, Windows 10 (64 bit). Java programs were compiled to bytecode with Eclipse 4.7.2, run with Oracle JDK8u112. Test numbers: 250 bit (c75): 966983290915691193309978723256242679920691599725908954700676674631843021151, factor 2166660942804222727904664493239497749 (121 bits) 260 bit (c79): 1405841556925214879486442303149405905001665390832024207523131521166180858938813, factor 67442061758209470276693046261 (96 bits) 270 bit (c82): 1862250708148641942690960669479655453558455211114669315970990094883431140413691063, factor 10131012562771734141422710036441 (103 bits) 280 bit (c85): 1124255513875297636309545520595967278216022444499041658628707408527781223819691431297, factor 102215939439709564867375590146800830467 (127 bits) 290 bit (c88): 1714638254587752572163813097700639375461962331568828069462681800410360936140704797782927, factor 118213006591252560634534512340187 (106 bits) 300 bit (c91): 1420645858748273907814607735289301772937523982503611315908309844444825252076415096683379639, factor 37001601928978936147228977127981 (105 bits) 310 bit (c94): 1504728267636063453737937497689480949465080318766121587410405654071410646640268764306438447777, factor 78826750148916873060910019453093 (106 bits) 320 bit (c97): 1520485323412100005395027120737880529234221500427246782721628759918241045629822884369979557002797, factor 26708589799276429676372119945486621441898621 (144 bits) 330 bit (c100): 1480043784220046663418677695827289686591546373143422996772942819804186784116179599537527918653095289, factor 62125133246163719560488825370539230413837849 (146 bits) 339 bit (c103): 1049318608354150719312497493537522807450843398013344125038634265072726507929273547596187217203526415417, factor 2254125207506194947465713574724871004145473711091193254616100967 (211 bits) The last number was supposed to have 340 bit, but sometimes my test number generator falls 1 bit short. Results: Bits Alpern (factor) PSIQS2.1 (factor) PSIQS4.0 (factor) Yafu 1.34.5 (factor) 250 126.8 3.57 59.0 1.66 35.9 1.01 35.5 1.0 260 187.1 3.74 111.6 2.23 68.5 1.37 49.9 1.0 270 402.4 4.31 227.3 2.43 141.8 1.51 93.3 1.0 280 735.6 5.16 424.1 2.97 256.4 1.80 142.5 1.0 290 2048.1 6.21 986.9 2.99 590.9 1.79 329.6 1.0 300 3763.5 6.34 1882.9 3.17 1199.1 2.02 593.1 1.0 310 7525.7 6.46 3571.4 3.06 2164.1 1.86 1163.9 1.0 320 12943.7 6.75 6028.7 3.14 3968.4 2.07 1916.4 1.0 330 - - 12460.7 3.17 8669.0 2.21 3918.9 1.0 339 - - - - 16669.1 2.48 6714.5 1.0