Profiler: usability ideas

[Zylann]

After testing a bit the profiler, I have a few ideas to improve its usability:

• Ability to focus spikes more easily. Half of performance bottlenecks can be seen as spikes, and focusing them in the profiler is currently a bit tedious since you have to be pixel-perfect when clicking on the graph.
  Could we have zoom or something allowing easy precision?
• Functions taking most time should be ordered first instead of last, because they are the point of profiling. I see I can click on the headers but it does nothing particular.

[akien-mga]

Not critical for the upcoming 2.1, so moving to the next milestone.

[Zireael07]

Being able to order the functions by time spent would massively improve the usability of the profiler. (As simple as making the click on the header sort decreasing/increasing)

[Zireael07]

Bump. Zooming in and ordering are needed.

Also in the monitors tab, what is the range of values for fps? It's weirdly difficult to see the difference between 15 and 30 FPS.

P.S. Where should I look if I want to improve those things?

[Calinou]

Note: Ordering functions from most to least expensive has already been implemented in 3.1 and later by #25354.

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