You can disable the UDP notifications at the client side and the Server/Relay side.
The effect will be that your clients are not notified of new or updated content, and instead only download and evaluate new actions, fixlets, analyses, etc. when they perform a scheduled gather. By default that is every twelve hours.
You can reduce this gather interval by configuring Command Polling on the clients, but ensure you do not overload your relays with the extra request traffic. That is a balance based on how many clients are attached to each relay. If you have more than a couple of hundred clients on a relay, I’d suggest those clients should poll no more frequently than every half hour (and your mileage may vary).