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Re: Camtasia
I am using camtasia studio to record whole screen of 3360x1050 (dual 22" LCD). Unchecking "Auto configure" at Tools->Options->Steams->Screen video options and setting "capture frame rate" 3 fames/sec will help to reduce resource usage.
Without it, most of CPU time will be used up by camtasia studo.
Good graphic card is also necessary to reduce CPU usage.
I used, Intel Duo 6600(2.4Ghz) CPU, 2GB RAM, ASUS EN7900GS TOP graphic card. Recording consumed less than 20% of CPU.
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