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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
I setup a quick JMH benchmark to compare implementations. I was only looking for big improvements, so I'm only reporting results below for the first solution, and Solution4 and Solution5 above. As you can see the combination of data representation and algorithmic improvements yield a speed up a bit over ten times compared to the original. That's pretty good for some fairly simple changes!
All the code is on Github if you want go further, or just see how I setup the tests and benchmarks. I hope it is useful!
NOTE:
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Hence, a higher number means a more popular project.