Note: this documentation is a bit outdated and needs to be rewritten.
Any bugs found in FFX 3 should be reported to the FFX 3 Bug Report Thread in the Mods forum at www.freedomreborn.net
FFX will tax your processor, memory and hard disk much more than the default game, as there is a lot more going on behind the scenes. For normal game situations on even relatively modest hardware, it shouldn't show too much if at all, but as you add more characters, FFX attributes, combo attributes, power swaps, plugins, etc. to a mission, the performance hit gets worse.
Also note that some scripts require much more computing power than others. For example, the Disguise attribute, when active, is much more likely to slow down your system than Superheroic.
There are a few problems with the FFX Control Centre.
Attributes which don't have a chance of ever working in Multiplayer have been disabled now. They're marked NOT MULTIPLAYABLE in the descriptions now, and are automatically disabled. The new attack types all work in multiplayer.
Customisations of all attributes and special attacks are disabled for multiplayer for both gameplay and technical reasons.
Important: The above applies to FFX 2.6; FFX 3.x has never been tested with multiplayer, so it's not really suppposed to work at all.