The algorithms in pipeline stage view cover the normal use case well, but have issues with excessively large FlowGraphs. This is most commonly caused when someone runs a loop (with steps and/or blocks embedded in it) that executes many times.

To reproduce, create and run a build with the following pipeline code and then view in stageview:

for(int i=0; i<9999; i++) {
   echo "Cycle ${i}"
}

The result is combination of high master CPU load, very long or incomplete UI requests, very large response datasets (MB), and/or high memory use.