Let's assume that our Appian instance is going to manage several processes which are basically poller, doing these tasks:
Let's say that we have:
In conclusion, we have something like 55 processes, let's round them to 60, which are doing the tasks listed above. Is this setup critical in terms of performance and system reliability ?
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It's not the number of processes that's going to be the problem, but the overall aggregate effect they're going to have on your system. Fine tuning them will probably net you more performance boost than reducing the frequency with which they run.
Check out how your database resources respond, what happens to your CPU and RAM. The size each one gets to and the length of time they sit before being archived are going to be some big factors to look into.