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# development
h

helpful-jackal-12093

10/17/2021, 4:27 PM
Another question, when changing a dependency for a test/pex binary target, we get a relatively big penalty (anything from 60-250 seconds), which rather large and really hurts the feedback loop, is this expected?
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Building requirements.pex with 75 requirements: aiobotocore==1.4.2; ...
Takes most of the time
c

curved-television-6568

10/17/2021, 4:48 PM
I've also noticed that building the requirements pex is a time consuming task. My impression is that it is largely pip that takes a lot of time.. wondering if there is something that could be done to help speed pip up..?
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hundreds-father-404

10/17/2021, 5:33 PM
h

happy-kitchen-89482

10/17/2021, 6:17 PM
Yeah, currently using a constraints file gives you a huge speedup (after the initial resolve)
And we are working on supporting multiple lockfiles to the same benefit