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Your config looks good from what I see.
You could do a "Show processes cpu" and see what kind of load your unit is under at different increments, 1 min, 5min, etc...
Next command is "Show memory heap" and you are looking to see how much is free compared to the size.
Another good troubleshooting tool is Ping Plotter. PingPlotter - Pinpoint Network Problems
If you get the pro version you can see the delay as it goes through different hops.
If you give me your public IP i can run it for you and provide results from my end. If you run it from LAN, then you can test it to the internet and also to the SIP server for delays.