It is the normal attack speed that every archer has in equalized battlegrounds but i think what you have seen are fast charges while using Penetrating Arrow and Radiant Arrow. That is because of the skill called Sequential Fire. The more opponents you hit with this skill the faster Penetrating and Radiant arrows charge.
I am currently using these: www.essentialmana.com/glyph-calc/#ar65:c36:d13:e013:f1:g2:j2:n4:o2:u1:w2:x136 Or if you don't like the 1 minute cooldown 30% heal skill you can use the +5 meters range Radiant Arrow and Penetrating Arrow glyphs: www.essentialmana.com/glyph-calc/#ar65:c136:d136:e013:f1:j2:n4:o2:u1:w2:x136
It doesn't really matter that much. Castanics have 1% more crit rate when attacking from the back & Human/Aman get 10% less damage if their HP is below 30%.
Ik this is old, but people got bored of the game and gender locking new classes people might like isn't helping it just shows that tera no longer cares about it's players and only which race do most players fap too or find cute.