D's Garbage Collector Problem

./higgs --perf_stats --nostdlib test.js comp time (ms): 4504 exec time (ms): 2 total time (ms): 4507 code size (bytes): 633036 peak mem usage (KB): 443608 ./higgs --perf_stats --nostdlib test.js comp time (ms): 1570 exec time (ms): 2 total time (ms): 1572 code size (bytes): 633036 peak mem usage (KB): 760828 ./higgs --perf_stats --nostdlib test.js comp time (ms): 968 exec time (ms): 2 total time (ms): 971 code size (bytes): 633036 peak mem usage (KB): 798372