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I did a test with a simple app and managed a couple million separate events per second. There shouldn’t be a noticeable impact from multiple subscriptions vs a handler hub.

Event handlers are relatively cheap, so it won’t be a problem unless you have a lot of event handlers.

As a side note, I don’t recommend to rely on the order of event evaluation.
So you may want to use single event handler if you want to explicitly order execution.

In my tests the bulk of CPU time for sending an event is in allocating members for the variable processed in SendEvent() . However, only one member is allocated for each separate object (event receiver), even if that object has multiple handlers, so my educated guess is calling multiple handlers for a single receiver is relatively cheap compared to the base cost of handling the event.