5000 timers per se should not be a problem to measure nor a problem to the 
app. It's not even a strain to the connections: it amounts to approximately 
83 pings per sec, which is not too much.

But the bigger question is why do you want this? Just to keep sockets 
alive? You can set this option in your websocket implementation of choice 
(well, the most used ones, at least). Tell ws to do it's own keepalive and 
you don't have to do bookkeeping.

If it's to relay changes in some sort of state to all the clients, then 
again - why not simply sending updates as they happen? That's kind of the 
advantage of websockets - if you wanted timers, you could simply schedule 
regular REST requests on the client and not mess with all of this.

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