How much memory does System.Text.Json save compared to Newtonsoft?

System.Text.Json typically uses 30-50% less memory than Newtonsoft.Json for serialization and deserialization operations. The savings come from using Span<T> and ArrayPool for buffer management, reducing allocations significantly. System.Text.Json allocates fewer temporary objects during parsing, decreasing garbage collection frequency and pressure. For high-throughput applications, this memory efficiency translates to better scalability and lower cloud hosting costs. The difference becomes more pronounced with larger JSON payloads and high request volumes. Memory savings vary by workload: simple objects show 30% reduction, complex nested structures can save 50% or more. Newtonsoft.Json allocates more intermediate objects during reflection-based serialization. System.Text.Json source generators eliminate reflection overhead, further reducing memory usage. For memory-constrained environments like containers or serverless functions, these savings matter significantly. Use our JSON Editor at jsonconsole.com/json-editor to prepare test data for benchmarking both libraries. Profile your specific use case with BenchmarkDotNet to measure actual memory differences.