Fluent is so slow (CPU consumption problem)

I am using fluent to simulate and analyse a flow past a cylinder. My computer has 8 cores and 16 logical processors. When open fluent, I always run in parallel with 8 solver processes. However, the simulation run very slow and I don't get the speed I am expecting. The task manager always shows that 5-6% of the CPU consumed by cx2010 while each of the 7 fl_mpi2010 consume 10% of the CPU. I have another 2 cores laptop which shows that 25% is consumed by the cx2010 while only 2 fl_mpi2010 files consume 10% each. Whats going wrong here and how can I increase the speed of my runs?

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