# About JuMP's speed of building an expression

**URL:** <https://discourse.julialang.org/t/about-jumps-speed-of-building-an-expression/129018>\
**Category:** Optimization (Mathematical)\
**Tags:** question, jump\
**Created:** [May 15, 2025, 4:49am UTC](https://discourse.julialang.org/t/about-jumps-speed-of-building-an-expression/129018 "2025-05-15T04:49:18Z")\
**Posts on this page:** 1\
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**Author:** ![WalterMadelim](https://avatars.discourse-cdn.com/v4/letter/w/3e96dc/32.png) [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Post date:** [May 15, 2025, 8:27am UTC](https://discourse.julialang.org/t/about-jumps-speed-of-building-an-expression/129018/4 "2025-05-15T08:27:23Z")

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In LinearAlgebra, I believe that `x' * A * y` are different from `dot(x, A, y)`.  
The latter has a LAPACK specialized method. x-ref [my previous comment](https://discourse.julialang.org/t/inner-product-grammar-is-neater-than-sum-index-in-jump-modeling-but-triggers-warning/124528/29).

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