There is no real hard limit on the number of device models or total number of models that can be managed by a single 9.4 SpectroSERVER. The rule of thumb is between 2000 and 2500 managed device models but again, that is not a hard limit.
There are two main factors:
- The hardware (amount of memory, speed of processor, number of processors disk speed, and bus speed)
- What you are doing with your Spectrum database. How many integrations, number of Global Collections, number of SpectroWatches, number of users, number of OneClick systems, polling intervals, number of traps per second processed, etc
I can take a 2000 device model database and load it on a high end Linux or Solaris system and bring it to its knees. I can take that same database and load it on my Windows laptop and make it run without any issues.
If you are having performance issues, please open a case with Spectrum support so a performance analysis can be done to determine where performance bottle neck is.