Set from PHP → php.ini settings → php.ini direct editing on XServer.
By default,
[Zend Optimizer]
zend_extension = opcache.so
opcache.jit = off
It should say above. Now, change it to follows.
[Zend Optimizer]
zend_extension = opcache.so
;opcache.jit = off
;JIT
zend_extension = opcache
opcache.enable = 1
opcache.jit = on
opcache.jit_buffer_size = 128M
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