On Friday, 8 March 2013 at 15:25:02 UTC, bioinfornatics wrote: > why when reading a huge file more i advance into the file more > that take time to get a line ? ---- StopWatch sw; while( !fastq1.empty ){ sw.start(); auto q1 = fastq1.next(); sw.stop(); writeln( sw.peek().msecs() ); } ---- That's because you never reset the StopWatch.