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Thank you for your answer. Of course, Raspberry Pi Zero is in non-desktop state.

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Normally, after logging in and entering ISPF, it is bearable to use.

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However, it is inconvenient that it takes about 2 to 3 minutes to log in again after a normal LOGOUT.

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The CPU usage of the hercules process confirmed with 'top' is close to 100%. So, as I mentioned earlier,

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I am currently using the method of maintaining the login state and RECON with TN3270,

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but in my opinion, the login process for loading ISPF seems to take quite a long time on Raspberry Pi.

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The interesting thing is that TK4 works fast.

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So, the MVS TK5 running on the Raspberry Pi feels like it is really slow, like a machine from the System 360 era.

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I have never used an actual System 360 or System 370.

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Even a very simple COBOL source (PRIMECOB) takes about 22 seconds to submit.

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It feels like experiencing the 60s or 70s.

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