Running\walking slower than others.

ISP: Delta-Net (Ukraine)
Type of Internet Connection: WiFi
Internet Connection Speed: Sorry, no idea.
Date & Time: All the time that character is in the game
Frequency: All the time.
World: Moogle.
Character Name: Irina Vaissman.
Race: Miqo'te F.
In-Game Time: 24\7.
Area and Coordinates: Limsa Lominsa Upper Decks (11.1\11.1)
Steps:
1. Just all the time, she is running slower than me, or every one else.
2. I do even run faster than her, when she in under the effect of "Sprint".
3. We have been trying to Google, search on FF14 forums, and watching true all of the setting, configuration and key-binds. Nothing helped.

Might be her computer.

When I played on my crappy laptop I noticeably ran much slower than my friends. Once I started using a (much nicer) computer I ran at the same speed as everyone else.
It was especially hard doing those timed beast quests from the Sylphs since I couldn't run fast enough....and lo, after the upgrade I could do them.

Check your framerate.

I am on a gaming laptop. when it runs on the vid chip I get about 30 fps. When it runs on the integrated graphics adapter I get 12 - 15 and run / walk slower than others.