Great write up @darkfader, very much appreciated!
If it works for affected installations (I do not have JunOS devices available), all fine.
Another approach could be disabling bulkwalk for those hosts by ruleset “disable bulk walks on snmpv2c/v3” (positive match) or “enable snmpv2c and bulk walk for hosts” (negative match). Does not have to bring the same time boost, but if the bulkwalk is the issue… 
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