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The default config for ATS leaves enables some buffering between ATS and the client.  While I believe some inbound buffering to be useful for HTTP streaming applications such as Internet Radio and YouTube, unfortunately YouTube starts "skipping" if that is enabled.  For now, I'm leaving these disabledthe cache will slowdown overall if these are set too high.

CONFIG proxy.config.net.sock_send_buffer_size_in INT 0
CONFIG proxy.config.net.sock_recv_buffer_size_in INT 0
CONFIG proxy.config.net.sock_send_buffer_size_out INT 0
CONFIG proxy.config.net.sock_recv_buffer_size_out INT 0128K

Step 4 - Secure

Maximum Inbound Concurrent Connections

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