opencv-python VideoCapture in dell EMC centos gets 10s delay

[libaolb0629]

System information (version)

• OpenCV =>4.1.1
• Operating System / Platform => centos7.7
• Compiler => python,anaconda

Detailed description

when i use

cv2.VideoCapture('') rtsp camera stream 

and then imshow the realtime frame,i get a 10s delay,sometimes 8s.
My machine is DELL EMC double cores.
The same code in other machine ,windows or other centos machine ,it shows the realtime camera.
i think if opencv is incompatible with the machine with double core .
I try change to ubuntu ,but it has same problem.
Hope for get your reply,thanks.
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Steps to reproduce

[bulingda]

Have you solved this problem？