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Dell Optiplex 990 lag ...?

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have just installed
  High Sierra 10.13.5 on my dell optiplex 990

problem : keeps hanging (lag) for 1sec in safari  or between programs

also when playing video on youtube little bit of glitch + hang for 1 sec. or 2 sec


Dell optiplex 990 - Core I7 Vpro 2600 3.4 GHz


graphics card : ASUS Radeon XR 560 AMD 2GB

HDD : 3.5 SATA





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