; --enable-opcache-file
; php.ini
opcache.file_cache=/var/tmp

; php-cli.ini
opcache.enable_cli=1
opcache.file_cache=/var/tmp
opcache.file_cache_only=1

$ time composer >/dev/null
real	0m0.040s
user	0m0.032s
sys	0m0.004s

$ time composer >/dev/null
real	0m0.019s
user	0m0.016s
sys	0m0.000s

$ time php -d opcache.enable=0 /usr/local/bin/composer >/dev/null
real	0m0.033s
user	0m0.032s
sys	0m0.000s