Free Pascal versus Java fastest performance Always look at the source code. If the fastest programs are hand-written vector instructions, does the host language matter? You might be more interested in the less optimised programs — more seconds, less gz source code. fannkuch-redux source secs mem gz cpu secs Java #3 40.36 39,932 1257 40.43 Free Pascal 10.54 11,220 1024 42.09 Java 10.71 40,324 1282 42.25 Java #2 46.85 38,492 514 46.91 n-body source secs mem gz cpu secs Free Pascal 6.27 11,340 1308 6.27 Free Pascal #2 6.28 11,340 1322 6.28 Java #5 6.77 40,632 1429 6.82 Java #4 6.86 40,516 1489 6.89 Free Pascal #3 7.16 11,340 1418 7.16 Java #2 7.32 40,508 1424 7.37 Java #3 7.38 40,492 1430 7.43 Java 7.76 40,724 1430 7.80 spectral-norm source secs mem gz cpu secs Free Pascal #3 1.44 11,344 625 5.70 Free Pascal #2 1.44 11,344 542 5.70 Java #3 1.54 42,324 756 5.93 Java 7.02 41,448 514 7.09 Java #2 2.39 41,092 950 9.25 Free Pascal 11.76 11,344 423 11.76 mandelbrot source secs mem gz cpu secs Free Pascal #8 3.86 32,612 952 15.40 Java #4 4.39 101,236 660 16.12 Java #2 4.11 83,924 796 16.21 Java #6 4.27 84,532 802 16.86 Java 25.66 40,860 665 25.73 Free Pascal #7 6.59 36,756 924 26.14 Free Pascal #3 26.52 11,340 526 26.52 Java #3 7.37 88,056 903 29.24 Free Pascal #2 10.99 32,680 825 29.44 Free Pascal 11.00 32,680 825 29.45 Free Pascal #6 7.49 36,084 781 29.69 pidigits source secs mem gz cpu secs Free Pascal #3 0.88 11,340 487 0.88 Java #3 0.92 38,380 764 0.95 Java #2 1.34 41,352 938 1.42 Free Pascal #2 5.34 11,340 797 5.34 Java 7.44 430,616 800 8.45 Free Pascal 14.64 11,344 3047 14.63 regex-redux source secs mem gz cpu secs Free Pascal 5.47 102,920 1298 5.47 Java 8.58 767,552 868 16.68 Java #6 5.40 637,728 740 17.08 Java #3 5.45 736,544 929 17.42 fasta source secs mem gz cpu secs Java #4 3.17 40,400 1524 3.27 Java #6 1.16 46,068 2543 3.65 Java #5 1.23 46,180 2473 3.79 Java #2 4.32 44,708 1257 4.45 Free Pascal #6 5.58 11,340 1190 5.58 Free Pascal #5 5.63 11,340 1220 5.63 k-nucleotide source secs mem gz cpu secs Java 5.03 361,196 1812 16.40 Java #6 7.17 357,700 1607 25.04 Java #3 7.12 357,568 1635 25.06 Java #4 35.38 201,052 1882 35.83 Java #5 18.82 208,376 2219 40.84 reverse-complement source secs mem gz cpu secs Java #6 3.02 2,027,152 752 3.69 Free Pascal #2 3.72 524,952 771 3.72 Java #5 4.46 1,094,060 1108 4.58 Java #4 5.51 1,886,052 651 5.62 Java #7 24.15 1,032,956 1647 6.20 Java #3 Bad Output Java #8 Bad Output binary-trees source secs mem gz cpu secs Free Pascal #7 2.03 132,220 968 4.94 Free Pascal #6 2.05 132,220 936 4.99 Free Pascal #5 2.06 132,220 923 5.00 Java #4 4.47 2,116,292 840 5.15 Java #6 4.88 2,058,280 529 5.59 Java #3 4.91 2,101,240 540 5.61 Java #2 5.05 2,095,888 552 5.73 Java #7 2.52 1,726,148 835 7.89 Free Pascal Free Pascal Compiler version 3.2.2 [2021/05/16] Java openjdk 20 2023-03-21 OpenJDK Runtime Environment (build 20+36-2344) OpenJDK 64-Bit Server VM (build build 20+36-2344 mixed mode, sharing) all Free Pascal programs & measurements all Java programs & measurements