Performance comparisons

Benchmark results comparing Immediate.Handlers against MediatR and other mediator implementations.

4 min read

All performance benchmarks reported use the following environment:

// * Summary *

BenchmarkDotNet v0.16.0-nightly.20260608.560, Windows 11 (10.0.26200.8655/25H2/2025Update/HudsonValley2)
12th Gen Intel Core i7-12700H 2.30GHz, 1 CPU, 20 logical and 14 physical cores
Memory: 31.69 GB Total, 21.22 GB Available
.NET SDK 11.0.100-preview.5.26302.115
  [Host]     : .NET 11.0.0 (11.0.0-preview.5.26302.115, 11.0.26.30315), X64 RyuJIT x86-64-v3
  Job-GVKUBM : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
  Job-IHFIKV : .NET 11.0.0 (11.0.0-preview.5.26302.115, 11.0.26.30315), X64 RyuJIT x86-64-v3
  Job-AZESIF : .NET 8.0.28 (8.0.28, 8.0.2826.26413), X64 RyuJIT x86-64-v3

InvokeAsync (aka Command)

This benchmark tests the various mediator implementations with a single command (no/Unit return value).

Implementation	Scenario	Runtime	Mean	Error	Gen0	Gen1	Allocated
Direct	InvokeAsync	.NET 11.0	0.9767 ns	0.0065 ns	-	-	-
Immediate.Handlers	InvokeAsync	.NET 11.0	2.3605 ns	0.0022 ns	-	-	-
MediatorNet	InvokeAsync	.NET 11.0	12.5804 ns	0.0454 ns	-	-	-
Foundatio.Mediator	InvokeAsync	.NET 11.0	14.0770 ns	0.0608 ns	0.0019	-	24 B
DispatchR	InvokeAsync	.NET 11.0	20.6877 ns	0.0292 ns	-	-	-
Axent	InvokeAsync	.NET 11.0	44.2312 ns	0.1712 ns	0.0063	-	80 B
MediatR	InvokeAsync	.NET 11.0	49.6130 ns	0.2401 ns	0.0102	-	128 B

InvokeAsyncT (aka Query)

This benchmark tests the various mediator implementations with a simple query with value response.

Implementation	Scenario	Runtime	Mean	Error	Gen0	Gen1	Allocated
Direct	InvokeAsyncT	.NET 11.0	22.8746 ns	0.0713 ns	0.0038	-	48 B
Immediate.Handlers	InvokeAsyncT	.NET 11.0	24.1921 ns	0.0680 ns	0.0038	-	48 B
MediatorNet	InvokeAsyncT	.NET 11.0	37.3381 ns	0.0689 ns	0.0038	-	48 B
Foundatio.Mediator	InvokeAsyncT	.NET 11.0	40.9700 ns	0.0764 ns	0.0057	-	72 B
DispatchR	InvokeAsyncT	.NET 11.0	47.7985 ns	0.1209 ns	0.0038	-	48 B
Axent	InvokeAsyncT	.NET 11.0	63.1785 ns	0.1873 ns	0.0082	-	104 B
MediatR	InvokeAsyncT	.NET 11.0	74.2955 ns	0.9705 ns	0.0197	-	248 B

InvokeAsyncTWithDI (aka FullQuery)

This benchmark tests the various mediator implementations with a query that includes a DI parameter and a behavior.

Implementation	Scenario	Runtime	Mean	Error	Gen0	Gen1	Allocated
Direct	InvokeAsyncTWithDI	.NET 11.0	32.8809 ns	0.0889 ns	0.0032	-	40 B
Immediate.Handlers	InvokeAsyncTWithDI	.NET 11.0	48.4441 ns	0.1384 ns	0.0032	-	40 B
Foundatio.Mediator	InvokeAsyncTWithDI	.NET 11.0	59.6983 ns	0.1802 ns	0.0051	-	64 B
MediatorNet	InvokeAsyncTWithDI	.NET 11.0	61.1463 ns	0.1275 ns	0.0031	-	40 B
DispatchR	InvokeAsyncTWithDI	.NET 11.0	73.2588 ns	0.2354 ns	0.0031	-	40 B
Axent	InvokeAsyncTWithDI	.NET 11.0	84.3546 ns	0.3107 ns	0.0076	-	96 B
MediatR	InvokeAsyncTWithDI	.NET 11.0	143.0193 ns	0.8873 ns	0.0439	-	552 B

Code and Full Results

The code can be found at: https://github.com/ImmediatePlatform/MediatorBenchmarks
The full results of the latest benchmark can be found at: https://github.com/ImmediatePlatform/MediatorBenchmarks/blob/main/Results/Benchmark-2026-06-11-report.csv