When you make a change in the Statsig Console, such as updating a targeting rule, it is expected that the new rule may take around 5 seconds to propagate. This is in line with our Service Level Objective (SLO). While an instant update might be desirable, it's important to note that this slight delay typically has no real impact on key metrics and user experience.
In the context of feature gates, for example, if you open a feature for Mac users and later remove access for Mac users and make it available for Windows users, there will be a slight delay before the change is reflected for Mac users. This is due to the Time To Live (TTL) associated with any type of hosted service.
Regarding the capacity of ID lists, each project can handle up to 10 million IDs. This means if you have 3 projects, each can handle its own list of 10 million IDs.