GitStress
v0.12.0
GitHub1
SECTION 6.0 // CONCURRENCY SATURATION DRAG RACE

Framework Concurrency Duel

Head-to-head architectural saturation comparison. Compare any two repositories side-by-side to discover which codebase chokes first under concurrent load.

FEATURED DUELS:FastAPI vs Express (Python vs Node)Gin vs Axum (Go vs Rust)tkngate vs nginx (Proxy Race)cal.com vs posthog (Prisma vs Django)tkngate vs msh (Go Proxy vs Go Mesh)
SIMULTANEOUS LOAD INJECTION HAMMERSimulating concurrent HTTP clients against both architectures
350 CONCURRENT CLIENTS
50 conns500 (Moderate)1,500 (Heavy)2,500 (Spike)4,000 (Saturation)
[HEADROOM CHAMPION]
posthog/posthog holds +2.7x more concurrent load than calcom/cal.com before socket exhaustion.
Post Duel to X ↗
CONTENDER A

calcom/cal.com

Microservice / Backend
GRADEF
SATURATION CEILING: 23 CONCURRENT[COLLAPSED: 429/504]
EST. P99 LATENCY:8500 ms
BOTTLENECK SYMBOL:Attendee.findByEmail
PRIMARY WEAKNESS:SELECT * FROM attendee WHERE email=? seq scan
Inspect Full Telemetry Dossier ↗
VS
CONTENDER B

posthog/posthog

Microservice / Backend
GRADEREFUSED
SATURATION CEILING: 62 CONCURRENT[COLLAPSED: 429/504]
EST. P99 LATENCY:7602 ms
BOTTLENECK SYMBOL:REFUSED — NO RUNTIME GRAPH
PRIMARY WEAKNESS:Scanned files do not expose server entrypoints, container limits, or database connection pools. GitStress halts to prevent hallucinating fake queues.
Inspect Full Telemetry Dossier ↗