Performance Baseline

Benchmark results measured on Apple M4 Pro (darwin/arm64), Go 1.25, make bench.

Invoice Generation (application/service/)

Benchmark	ns/op	B/op	allocs/op
GenerateInvoice_Subscription	1,527	2,940	84
GenerateInvoice_UsageBased	13,114	2,845	49
GenerateInvoice_WithPlugins (3 discount)	2,091	4,141	120
GenerateInvoice_WithCredits (10 entries)	1,517	3,004	85

Event Replay (domain/contract/)

Benchmark	ns/op	B/op	allocs/op
LoadFromHistory_10Events	9,235	4,643	111
LoadFromHistory_100Events	69,181	35,623	786
LoadFromHistory_1000Events	642,212	345,445	7,536
MarshalSnapshot	1,944	1,386	18
LoadFromSnapshot	4,568	2,177	55
LoadFromSnapshot_Then100Events	68,636	36,600	805

Pricing Models (domain/pricing/)

Benchmark	ns/op	B/op	allocs/op
FlatPrice_CalculatePrice	0.25	0	0
TieredPrice_Graduated_10Tiers	3,219	5,019	232
TieredPrice_Volume_10Tiers	245	344	19
UsagePrice_Simple	125	216	10
UsagePrice_WithMinMax	212	408	14

Credit Consumption (domain/balance/)

Benchmark	ns/op	B/op	allocs/op
Consume_Sequential (100 ops)	22,287	43,206	1,500
Consume_FullyConsumed	196	400	11
IsExpired	1.4	0	0

Plugin Dispatch (plugin/)

Benchmark	ns/op	B/op	allocs/op
GetDiscountHooks_10Plugins (parallel)	147	248	4
Register_Sequential (20 plugins)	1,636	3,656	14
GetDiscountHooks_ConcurrentReadWrite	745	1,877	4

Event Store & Repository (infrastructure/inmemory/)

Benchmark	ns/op	B/op	allocs/op
EventStore_Append	369	560	2
EventStore_Append_Batch10	1,449	7,120	6
EventStore_Load_100Events	2,940	20,480	1
EventStore_SaveSnapshot	72	571	0
EventStore_LoadSnapshot	31	96	1
BalanceRepository_FindAvailable_100Entries	1,605	2,224	10

How to Run

make bench                    # Run all benchmarks
make bench | grep Benchmark   # Summary only

For statistical comparison, use benchstat:

go test -bench=. -benchmem -count=5 ./... > old.txt
# ... make changes ...
go test -bench=. -benchmem -count=5 ./... > new.txt
benchstat old.txt new.txt