Yeah, Usain Bolt was timed at over 40 feet per second. Even a 6th grader can run the 100m in 13 seconds, which amounts to 25 feet per second. Kids can do 1K runs at 15 feet per second, which is what the Rogue is achieving with a "double dash".
How else are the rogues going get to fix the sprinting competition at the local festival? ☺
Either that, or you need to find yourself a different game...
Double dash is perfectly viable rules and logic wise... 90ft per 6 seconds is still slow...
Yeah, Usain Bolt was timed at over 40 feet per second. Even a 6th grader can run the 100m in 13 seconds, which amounts to 25 feet per second. Kids can do 1K runs at 15 feet per second, which is what the Rogue is achieving with a "double dash".
In the older versions of the game, back before backstab was a reliable ability, your movement speed was severely hindered by any sort of medium or heavy armor. The thief was faster than the fighter, but primarily for this reason. Note that heavy armor in 5E does not provide any penalty to movement speed.Game-wise, unless I am sorely mistaken, Rogues have never been thematically/historically been the class with the 'fast movement speed' shtick. And I will understand why other DM's will interpret it differently. I just don't think Rogues have thematically needed anything else aside from backstabby-stabbity, skill monkeyness, and shenanigans.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.