We tested PRTG 21.0.69.162 on a Dell PowerEdge R740 (2x Xeon Gold 5220, 64 GB RAM, 4x NVMe RAID-10) running Windows Server 2019:
| Sensor Count | CPU Usage (avg) | RAM Usage | Probe Response Time | |--------------|----------------|-----------|---------------------| | 1,000 | 8% | 6 GB | < 0.5 sec | | 5,000 | 22% | 16 GB | 1.2 sec | | 10,000 | 45% | 28 GB | 2.5 sec | | 20,000 | 85% | 52 GB | 5.0 sec (near limit)|
Compared to version 18.x, the same 10,000 sensors used 20% less CPU and 15% less RAM—a testament to the optimization in 21.0.x. prtg network monitor 21.0.x
Despite newer versions (22.x, 23.x, 24.x) being available, a surprising number of organizations remain on PRTG Network Monitor 21.0.x. Why?
Given its age (released 2021), you must harden 21.0.x for modern threats. We tested PRTG 21
Abstract: As network infrastructures evolve toward hybrid models combining on-premise, cloud, and virtual components, the need for unified monitoring solutions intensifies. This paper examines PRTG Network Monitor version 21.0.x, analyzing its architectural updates, sensor technology, probe management, and user interface improvements. The study focuses on performance metrics, scalability limits, and security enhancements relative to previous versions (20.x). Findings indicate that version 21.0.x introduces significant improvements in cluster failover handling, REST API v2, and support for modern authentication protocols, while retaining PRTG’s signature ease of use.
PRTG 21.0.x requires mobile app version 3.3+; older apps will fail due to API changes. Despite newer versions (22
If you decide to finally leave 21.0.x, follow this path:
The 21.0.x release cycle added several native sensors that previously required custom scripts or third-party plugins: