What is cache uniform expressions ？

Development Rendering
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Hi，guys，I’m so confused by this Cache uniform EXpressions thing in the CPU profiling.
What are Cache Uniform Expressions including? What does that stand for?
If I want to decrease this value, what should I do?

cache expression
cache expression800×197 30.9 KB

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Uniform expression cache is a system, that analyzes material graph, detects parts of it, that are uniform(that is, having the same value for all the pixels or vertices), removes them from material and replaces with a single parameter, value of which is evaluated and updated as needed. And the time you are seeing is the time spent updating all such values in your scene.

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Thank you for clarifying this to me as well. Your comment is very helpful.

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So uniform expression cache explains the complexity of material? The simpler the material is ，the less time it takes？