End-user latency
The end-user latency metric defines how responsive a remote desktop or application is. The following figure confirms the common assumption that the better the network connection, the lower the end-user latency. The chart shows that average end-user latency more than doubles for a remote user with a “Very Poor” network connection when compared to an office user with a local LAN connection.
The following figure shows the end-user latency variability between the graphics-accelerated workloads.
Remote users with a “Standard” to “Good” network connection can expect to see the same consistent user experience, with end-user latency distribution well below 500 ms. Latency consistency decreases as the network performance decreases, with outlying values in excess of 2 seconds for specific applications. The following figures show the user experience latency distribution for different workloads.
Frame rate
The frame rate metric defines how smooth the end-user experience is. It is a measurement of “smoothness” at an endpoint device when a user is interacting with a remote VDI desktop or application. The nVector tool samples frame rates at 5-second intervals for the duration of the workload.
The higher the number of endpoint frames per second, the smoother the end-user experience. The average fps number show a marginal increase with network performance, with minimal variability shown between the application workloads, as shown in the following two figures.
There was no consistent trend for fps distribution among the workloads, as shown in the following figures. Consistency appeared to be application or workload dependent. Frame rate limiting can be clearly seen for some applications, as shown in the following figure:
Image quality
While image quality remained highly consistent across all network categories for some workloads, it showed a noticeable drop in the “Very Poor” network category for others. Remote image quality appears to be related to a combination of the workload and the network performance. The following figure shows the average image quality: