In your experience, how many point features can be added to an OpenLayers vector layer (new OpenLayers.Layer.Vector("Point Layer")) before it goes unusably slow?
My use case is to display points from a database table. The user can decide which time frame to visualize. Therefore the result can be from very few to potentially 100,000s of points. I'd like to introduce a reasonable limit and warn the user if his query would return more features.