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Starting in Junos OS Release 18.1R1, you can defer multipath calculation until all BGP routes are received. When multipath is enabled, BGP inserts the route into the multipath queue each time a new route is added or whenever an existing route changes. When multiple paths are received through BGP add-path feature, BGP might calculate one multipath route multiple times. Multipath calculation slows down the RIB (also known as the routing table) learning rate. To speed up RIB learning, multipath calculation can be either deferred until the BGP routes are received or you can lower the priority of the multipath build job as per your requirements until the BGP routes are resolved.