Replay speed change is pretty inconsistent.
On a map with DT enabled, setting the replay speed to 0.5x would make the map play as if it was No Mod.
On a map without any speed altering mods enabled, setting the replay speed to 2x would make the replay play as if DT was enabled, and setting it to 0.5x would make it play as if HT was enabled.
BUT!
On a map with HT enabled, setting the replay speed to 2x should logically make it play as if it was No Mod, however, it instead makes it play faster than No Mod.
On a map with DT enabled, setting the replay speed to 0.5x would make the map play as if it was No Mod.
On a map without any speed altering mods enabled, setting the replay speed to 2x would make the replay play as if DT was enabled, and setting it to 0.5x would make it play as if HT was enabled.
BUT!
On a map with HT enabled, setting the replay speed to 2x should logically make it play as if it was No Mod, however, it instead makes it play faster than No Mod.