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Do you see any IP listed in "Anti-DDoS Blocked IP" of real-time stats page of LSWS Admin Console? if none or not many, then your high system load could be caused by something else instead of excessive-established-connection kind of ddos attack.
Did you run 'top' from command line and see which process(es) consume the most resources (cpu cycles, i/o wait, etc) which helps identify the cause of high system load?
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