Issue #16837 has been reported by k0kubun (Takashi Kokubun).

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Bug #16837: Can we make Ruby 3.0 as fast as Ruby 2.7 with the new assertions?
https://bugs.ruby-lang.org/issues/16837

* Author: k0kubun (Takashi Kokubun)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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## Problem
How can we make Ruby 3.0 as fast as (or faster than) Ruby 2.7?

### Background
* Split ruby.h https://github.com/ruby/ruby/pull/2991 added some new assertions
* While it has been helpful for revealing various bugs, it also made some Ruby programs notably slow, especially Optcarrot https://benchmark-driver.github.io/benchmarks/optcarrot/commits.html

## Possible approaches
I have no strong preference yet. Here are some random ideas:

* Enable the new assertions only on CIs, at least ones in hot spots
  * Not sure which places have large impact on Optcarrot yet
* Make some other not-so-important assertions CI-only
* Provide .so for an assertion-enabled mode? (ko1's idea)

I hope people will comment more ideas in this ticket.



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