not quite FAQ related, but i noticed a few things that may be potential flaws that may impact the game's leveling flow. the Amount of Experience Points Required to gain a level, is a lot higher than the rate at which a character can gain experience points can reliably reach without dedicating an excessive effort to grinding instead of relying on quests as the primary XP filler. there wasn't quite a thread to report beta feedback, but this is my first day's progress.
i had to clear a level 10ish dungeon at level 4ish due to the lack of quest experience that most characters tend to rely upon, plus, there is also a lack of available level 5-7 gear that could help characters like myself whom tried to play the dungeons while drastically underleveled.
the easiest way to fix this in the official version would be to either drastically lower the amount of experience required to gain a level to make a more reasonable yet smaller scale, or to bloat the XP gained from monsters, quests and objectives to compensate for the higher XP numbers. i would personally vote for reducing the amount of experience to gain a level and use a smaller scale that calculates faster.
it doesn't have to be instant, but it shouldn't take 2 dozen quests to get from level 4 to level 5 because experience from quests just isn't plentiful enough to keep up with the content. leading to the grindfest that nearly killed Tera, Elsword and Aura Kingdom outside of their limited communities of faithful players. my second suggestion, is a currency squish, if there is anything bound to cause lag, it is large numbers and repeated calculations, this can be fixed by both squishing currency rewards and currency based costs alongside them.