Is there a limit for the number of objects in an appian application ?
will there be performance decrement if the number of object is increased from 100 to 500 ?
Discussion posts and replies are publicly visible
No limit, but in the past I found certain things really started dragging when a single app package grows to several thousand items. But that may have been improved somewhat in the last few major versions.
I agree, I usually try to limit to ~2000 objects to be able to manage application packages more easily. I would guess there is no obvious difference between 100 and 500.
One thing to keep in mind is that an application is really just a method to organize your objects - you could have a bunch of related objects spread across many different applications, which might actually make your deployments / organization a bit easier.