pass1 - making usageList (24 chroms): 157 millis pass2 - checking and writing primary data (1101097 records, 3 fields): 974 millis pass1 - making usageList (24 chroms): 78 millis pass2 - checking and writing primary data (554690 records, 3 fields): 490 millis pass1 - making usageList (24 chroms): 33 millis pass2 - checking and writing primary data (234808 records, 3 fields): 239 millis pass1 - making usageList (24 chroms): 16 millis pass2 - checking and writing primary data (129528 records, 3 fields): 128 millis