When job creation takes to long, ecflow server writes a message to the log file. It can be slow for a variety of reasons.

• The disk where the server is running is really slow.
• The number of includes in the .ecf may be excessive, causing where large job files.
• Preprocessing takes to long. (i.e. replacing %VAR% in the .ecf file, with variables in the Node tree), removing comments and manual sections, etc.
• Server may be running out memory.
• The server is starved out CPU time, competing with other process.

When the ecflow server is started, the ECF_TASK_THRESHOLD is read form the environment. Job creation taking longer than this threshold are written as a warning in the log file.

However in most cases this was ignored by the user,  until some other problem arises.

In ecflow 5 series, they will be notified in the GUI  that the  task has exceeded this threshold, by a new icon.