Nodejs is slow after nginx proxy

see that many netizens say it is the problem of nginx configuration, refer to the online answer and do not find the problem, please give me some advice.

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nginx:

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your understanding is wrong. Nginx is only used for proxy forwarding. If nodejs is slow, it is a problem in the application layer. Please check whether the server takes up too much memory, or check whether the code has a large amount of data integration. It is recommended to optimize the code. Nginx only needs to optimize some timeout time

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b2b9a0-2baa5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2b9a0-2baa5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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