CoRE and Piston Rules Engine, first design steps

[rontalley]

As a rule of thumb, try to keep your pistons relatively small and the code simplified. “Mega” Pistons are cool but causes issues in particular being slower than normal. The more conditions and actions the Piston has to evaluate, the longer it will take to fire.

I believe with the new rules, each CoRE instance can support 500 Pistons. More info here:

Child SmartApp/Device Install Limits

tl;dr - The platform update scheduled for the week of April 17, 2017, will include limits to the maximum number of child Devices or SmartApps (or a combination of) that SmartApps or Device Handlers may have. This limit will be a maximum of 500 children. SmartApps and Device Handlers may themselves have child SmartApps or child Devices. For example, Smart Lighting consists of a parent SmartApp (the SmartApp you install from the marketplace), and each Lighting Automation is an instance of a child SmartApp. Every different Lighting Automation you create in Smart Lighting is creating a new instance of the child SmartApp. Similarly, SmartApps may create child Devices; this is a common pattern used for LAN- or Cloud-Connected Devices, where the Connect or Service Manager SmartApp discovers and…