Um, yes. That's almost a perfect graph of an old project management saying:
The first 90% of the work is done in the first 10% of the project.
The last 10% of the work is done in the final 90% of the project.
At first glance I wondered why the person who made this graph would undo a lot of their work after 15% of the time into the project, but then I remembered that Work is defined as Energy / Time, so this graph shows the Energy / Time over Time, which is the calculus differential of Work, indicating the rate of change of energy rather than quantity of the task achieved. I am happy with that.
Funny and so true