# Jeff Bezanson remarks on LLVM "getting slower and slower"

**URL:** <https://discourse.julialang.org/t/jeff-bezanson-remarks-on-llvm-getting-slower-and-slower/39637>\
**Category:** Internals & Design\
**Created:** [May 17, 2020, 2:37pm UTC](https://discourse.julialang.org/t/jeff-bezanson-remarks-on-llvm-getting-slower-and-slower/39637 "2020-05-17T14:37:52Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![Palli](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/palli/32/3380_2.png) [@Palli](https://discourse.julialang.org/u/Palli)\
**Post date:** [May 20, 2020, 10:58pm UTC](https://discourse.julialang.org/t/jeff-bezanson-remarks-on-llvm-getting-slower-and-slower/39637/12 "2020-05-20T22:58:10Z")

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> [@Albert\_Zevelev](#):
>
> I thought there is a trade off between compilation speed & execution speed […] Is this a false trade off?

Yes and no.

Bold claim: “optimising compilers are operating in a region between a problem that’s not worth solving (most parts of most programs) and a problem they can’t solve (the really performance critical parts)”

I quote it (the claim from writing pointing to Bernstein’s “Death of Optimizing Compilers”) at my new thread: [Rethinking optimization, lower ok for all Julia code (for e.g. faster startup) as a default?](https://discourse.julialang.org/t/rethinking-optimization-lower-ok-for-all-julia-code-for-e-g-faster-startup-as-a-default/39843) and originally found link to it at the Benchmark Game.

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