MQTT Performance Tests: Concurrent Connections

Connections

Connection tests measure how many client connections a broker can accept and how connect latency behaves as the number of concurrently connected clients grows. Each scenario connects clients in batches and records, per interval, how many connections completed and their average latency.

100K Connections

Server Host: 8xCPU, 20GB RAM
Clients Host: 8xCPU, 32GB RAM
MQTT Protocol: 3.1
MQTT QOS: 1

Server	Avg Connections	Avg Latency
XMQ	100,000	305us
Mosquitto	100,000	308us
EMQX	100,000	655us
NanoMQ	100,000	4.13s

XMQ

Mosquitto

EMQX

NanoMQ

500K Connections

Server Host: 8xCPU, 20GB RAM
Clients Host: 8xCPU, 32GB RAM
MQTT Protocol: 3.1
MQTT QOS: 1

NanoMQ timed out during the test. Only 395K clients completed connections.

Server	Port	Max CPU	Max RAM	Avg Connections	Avg Latency
EMQX	1882	272%	6.2Gb	500,000	692us
Mosquitto	1883	12%	0.43Gb	500,000	368us
XMQ	1884	17%	2.1Gb	500,000	398us

EMQX

Mosquitto

XMQ



Credits:	The XMQ web site is provided by Linotex.	The XMQ and SPTK Windows installers are created with Advanced Installer free Open-Source license.