pass1 - making usageList (24 chroms): 194 millis pass2 - checking and writing primary data (1313244 records, 3 fields): 1181 millis pass1 - making usageList (24 chroms): 92 millis pass2 - checking and writing primary data (641317 records, 3 fields): 630 millis pass1 - making usageList (24 chroms): 36 millis pass2 - checking and writing primary data (251365 records, 3 fields): 242 millis pass1 - making usageList (24 chroms): 18 millis pass2 - checking and writing primary data (128066 records, 3 fields): 132 millis