This article explain how many devices can be supported for a SonicWave 200,400 and 600 series.
SonicWaves 600 Series:
Maximum devices: 256
Recommended: 150
SonicWaves 400 Series:
Maximum devices: 128
Recommended: 48
SonicWaves 200 Series:
Maximum devices: 128
Recommended: 30
For a better user experience, the advice is to follow the recommended quantity of devices connected as described above.
For a large number of users is recommended to have more SonicWaves available in order to split the load of the number of devices connected.