What if the video tag plays the video very slowly for the first time on the mobile phone?

what if the video tag plays videos very slowly on the mobile phone for the first time?
Video is only available in 1.64MB mp4 format. It takes a long time to load for the first time. Is there any good solution?

Dec.16,2021
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-64f5-1be19ba-3156d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be19ba-3156d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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