Evaluate performance in a buzzdetect analysis log. Reports:
duration_total - how many seconds did the analysis take?
duration_audio - how many seconds of audio were analyzed?
analysis_rate - how many seconds of audio were analyzed per second of wall time? NOTE! This does NOT use duration_total as the divisor, it starts counting when the first chunk is reported.
bottleneck_time - how long did analyzers wait for streamers to fill the queue?
duration_warmup - how long from the launching of analysis until the first chunk was analyzed? Includes results checking and cleaning, streamer launching, etc.