MATLAB: Simulink Real Time are the benchmark results acceptable

benchmarkMATLABsimulinkSimulink Real-Timeslrttarget pcxpc

Hi,
I'm checking the performance of my target computer. I suspect the results are not satisfactory, however I will be thankful for an opinion of an advanced user. Here are the resutls:
Benchmark results for model: Minimal Number of blocks in model: 3 Elapsed time for model build (sec): 7.3 Elapsed time for model benchmark (sec): 224.9 Minimal achievable sample time (microsec): 24.5
Benchmark results for model: F14*1 Number of blocks in model: 61 Elapsed time for model build (sec): 8.5 Elapsed time for model benchmark (sec): 222.8 Minimal achievable sample time (microsec): 25.9
Benchmark results for model: F14*5 Number of blocks in model: 305 Elapsed time for model build (sec): 10.1 Elapsed time for model benchmark (sec): 269.6 Minimal achievable sample time (microsec): 29.3
F14*10 FAILS at sample time 0.000028, execution time ~2s. The target computer gets then disconnected and the connection cannot be restored unless I restart the target. F14*25 fails at sample time 0.000035, execution time ~8s.
Specs: Target: Intel Core i5, 3.3GHz
Host: Intel Core i5, 2.53GHz; 64-bit Windows 7, MATLAB R2014a
RS-232 Connection