Mobs generated with edited movement speed are not affected, as they continue to have the same speed as default by el game 😞
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Exactly this
/ summon minecraft:skeleton ~ ~ 1 ~ {PersistenceRequired: 1b, LeftHanded: 0, CanPickUpLoot: 0b, Attributes: [{Name: "generic.movementSpeed", Base: 0.5f}]}
What exact commands are you trying to use?