Optimize pfsense to receive incoming 300 connection

[openaspace]

Hello.
I'm using a Nimble streaming server where i receive in 10 minutes around to 300 incoming connection on the port 8081...

Now happen that when i reach 200 connection after some minutes ..there is a disconnection that disconnect my fffmpeg encoder to the stream vps and obviously all the my viewers.

After 4/5 seconds the connection is restored...

How i can encrease performances and avoid drops?