develnytprofhtml is bit slow, you know. why it's slow? so it generates very big 'dot' file for graphviz. Normally, the people want to profiling doesn't need it. --minimal, -m Don't generate graphviz .dot files or block/sub-level reportsIf you don't want to generate graphviz dot file, try to run nytprofhtml --minimalIt's pretty faster. Here is a benchmark. --minimal is very fast. $ time nytprofhtml