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@Velocio
Yeah.
I was wondering where the load was coming from, and specifically why it was affecting just one server all the time. But only one server gets the updates, and it was that one which was having trouble.
At peak it was receiving 90 requests per second. That's a bit much.
It's still doing that now, and I have architected it to take the load (it's all from memory)... so it's not the traffic that is the problem. The problem is refreshing the cache... I hadn't really put a lot of thought into that as I didn't think it was going to be this busy. I'm re-thinking it now, will drop in a new solution this evening.