> For one, most JIT implementations only optimize once, instead of continuously. The result is machine code that is optimized for the sorts of things done at startup

Funny you should mention that - the author of this blog post has another post on fixing that problem for one specific (but very practical) case where we want to disregard some profiling information from the startup phase because it pollutes the genuine profiling information.

https://engineering.shopify.com/blogs/engineering/optimizing...