When you summon a villager with slowness or speed, the villager isn't affected:
Commands:
/summon Villager ~ ~1 ~ {ActiveEffects:[{Id:1,Amplifier:50,Duration:1000000}]}
/summon Villager ~ ~1 ~ {ActiveEffects:[{Id:2,Amplifier:50,Duration:1000000}]}
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Confirm duplicate
Please provide the exact command you've used.