How to solve the problem of long content download time?

how to solve the problem that the content download time of ajax request is too long? As in the picture, this time is a few milliseconds, but my question now is that this time is more than 1 second? How to optimize it? have you ever encountered

of this problem?
Performance-optimization ajax
Mar.14,2021

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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-64f5-1b34ae3-2bf28.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b34ae3-2bf28.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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