I've been running RemoteHams RCForb client with my Flex-6600 for about six months, but lately I'm experiencing significant audio delay (3-4 seconds) and occasional dropouts during SSB operations. Internet connection is solid at 100/20 Mbps with 18ms ping to the server. The delay seems worse on 20m during band openings. Anyone else seeing similar issues with recent versions?

Running version 4.2.1 server software on a dedicated Windows 10 machine with CAT control via USB. Audio interface is using the built-in FlexRadio SmartSDR audio streams.

I had similar latency with my 6400M - turned out to be buffer settings in SmartSDR. Try reducing the DAX buffer size to 64 samples and disable any unnecessary panadapter displays. Also check if Windows audio enhancements are enabled - they add significant delay.

Are you using the dedicated Ethernet port on the Flex for CAT/audio or sharing with your internet connection? The 6600 really benefits from having SmartSDR traffic isolated on its own network segment. I run mine on 192.168.1.x with a separate NIC just for the radio.

Quality of Service (QoS) configuration on your router is crucial for VoIP operations. Set RemoteHams traffic to high priority and limit background applications. I've seen dramatic improvements after configuring proper traffic shaping - reduced my average delay from 2.8s to under 500ms.