I suddenly found that the refire_delay in the weapon_equip.ini had been rounded! 0.12 was rounded to 0.1, 0.17->0.2, 0.33->0.3 .
I decompress a new weapon_equip.ini from the freelancer.iso and found it has been changed too!
I open and edit .ini files use Tinyfish FL INI Editor V1.44.