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[Chareyre <question192485@xxxxxxxxxxxxxxxxxxxxx>]

Question #192485 on Yade changed:
https://answers.launchpad.net/yade/+question/192485

Chareyre proposed the following answer:
Hehehe

You forgot to mention these in your question:

if bla:
  O.saveTmp()
  O.loadTmp()
start_time = O.realtime
O.run(1000,True)
stop_time = O.realtime

So, you are not comparing loadTmp() vs. load(). You comparing loading
vs. NOT loading.

Comparing would need this:
if bla:
  O.saveTmp()
  O.loadTmp()
else:
   O.save("bla.yade")
   O.loadTmp("bla.yade")

Clearly, some internals are not saved with the simulation (e.g. the collider has to regenerate itself), so loading introduces some initialization operations.
In addition, be careful, you are not comparing the same number of iterations in your exemple above (1000 vs. 1100).

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