Steven Giesel • 2/15/2023

A (performance) quirk with JsonSerializer

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This technical article investigates a performance issue in C#'s System.Text.Json.JsonSerializer. It demonstrates through benchmarks that creating a new JsonSerializerOptions instance for each serialization call, instead of reusing a static instance, leads to drastically increased execution time (3.84x slower) and memory allocation (3.04x more). The post explains the internal caching mechanism behind this behavior, providing insights for C# and .NET developers writing high-performance code.

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A (performance) quirk with JsonSerializer

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