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CCS/TMS320F28377D: Why is CPU2 running much slower in dual-core mode?

Part Number: TMS320F28377D

Tool/software: Code Composer Studio

Why is CPU2 running at a much slower speed? The same program, when used as CPU2, needs to run 45us (viewed with GPIO output signal), only 12us when used as CPU1! This is why, is there any register that needs to be set?

When the CPU 2 is activated, the operating speed of the CPU 1 is correct (indicating that there is no problem with the initialization), and the CPU 1 initial program adds "IPCBootCPU2 (C1C2_BROM_BOOTMODE_BOOT_FROM_FLASH);". Is there anything else that needs to be set?
Thank you!