Twitching Speed  

This is NOT over-haste. Overhaste effects are listed as v3 haste, such as Aura of the Poet, shown as:

1:  	Increase Spell Damage by 21% 
2: 	Increase Haste v3 by 25% 
3: 	Limit: Effect(Hitpoints allowed) 
4: 	Limit: Max Level(85) (lose 5% per level over cap) 
5: 	Limit: Spell Type(Detrimental only) 
6: 	Limit: Target(AE PC v1 excluded) 
7: 	Limit: Target(PB AE excluded) 
8: 	Limit: Target(Targeted AE excluded) 
9: 	Limit: Target(Uber Giants excluded) 
10: 	Limit: Target(Uber Dragons excluded) 
11: 	Limit: Combat Skills Not Allowed

Note the Slot 2 = Increase Haste v3 by 25% which means overhaste, if the spell data doesn't say Haste v3, then it's not overhaste. Where as this effect is:

3: Increase Attack Speed by 2% (L1) to 50% (L49)

Which means regular casted haste.

There are three types of Haste, worn (no buff icons in the buff windows), casted normal haste, and casted over-haste. Worn + Normal casted haste has a limit of 100% total. Casted Over-haste will go over the 100% limit, if you have are at the limit or close with the combination of worn + normal.

Neither Miraculous Visions nor this one are over-haste. The reason you can have multiple haste buffs in your buff window(s) is because buffs are only blocked / overwritten if the slot numbers are the same. Refer to this post for an explanation of why and how you can have multiple co-existing, but non-stacking buffs.

Yther Ore.