Thank you for the reply AidenElenor.

When you set the game to fullscreen mode, What resolution is it at? If it defaults to 1800p then that would bee too much for your GPU most likely. If you experience drops at 1080p, then go to the graphics settings (System Configuration > Graphics) and select one of the Laptop specific options (you can choose a lower preset or customize it but these presets are optimized for most laptops). If you are still experiencing issues, check your laptop's power settings, if it is set to something like 'Power Saver' then it may only be using the CPU's integrated graphics instead of the GPU. Select 'High Performance' if it is not already selected.

Please let us know if one of these fixes the issue.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!