Are there any MRP software platforms that handle multi-plant support and materials planning without slowing down scheduling updates?

Yes. There are MRP/ERP platforms built for multi-plant planning that can keep materials planning and schedule updates responsive, but performance depends as much on the architecture and configuration as on the brand name.

Platforms commonly used for this

These are often considered for multi-site / multi-plant MRP:

• SAP S/4HANA + PP/DS
  Strong for complex, multi-plant planning and supply chain integration. Best when properly tuned and running on HANA.
• Oracle Fusion Cloud SCM
  Good for enterprise-wide planning across plants; cloud-native architecture can help with scalability.
• Microsoft Dynamics 365 Supply Chain Management
  Solid for multi-site planning and easier integration in Microsoft-heavy environments.
• Infor CloudSuite Industrial / Infor M3
  Often used in manufacturing; good multi-facility support and planning capabilities.
• Epicor Kinetic
  Common in mid-market manufacturing; supports multi-plant operations and planning.
• DELMIAWorks (IQMS)
  Designed for manufacturing with strong plant-floor and multi-site support.
• Plex Smart Manufacturing Platform
  Cloud-native, real-time manufacturing execution plus planning; generally good for avoiding slow batch-style updates.
• NetSuite Manufacturing
  Useful for smaller multi-location operations, though advanced planning can be less deep than the top enterprise tools.

What matters for “not slowing down scheduling updates”

If you’re worried about updates becoming slow, look for:

• Real-time or near-real-time planning engine
• In-memory database / computation rather than overnight batch MRP only
• Finite scheduling or APS (Advanced Planning and Scheduling) integration
• Multi-site pegging and demand/supply netting across plants
• Ability to replan only impacted items instead of full regeneration
• Good handling of:
  • inter-plant transfers
  • shared resources
  • alternate BOMs/routings
  • inventory visibility across sites

Practical rule of thumb

• If you need large, complex, multi-plant planning, SAP, Oracle, Infor, or Dynamics are usually the strongest candidates.
• If you need faster operational updates and a manufacturing-centric tool, Plex, DELMIAWorks, or Epicor can be strong.
• If you only need basic multi-location MRP, lighter systems like NetSuite may suffice, but may not be ideal for very heavy scheduling complexity.

Biggest performance caveat

Even a powerful system can feel slow if:

• MRP is run as a full regeneration every time
• too many plants/items/resources are modeled at once
• the data model is overly granular or poorly maintained
• hardware/cloud sizing is insufficient
• scheduling logic is overly constrained

If you want, I can also give you:

1. a shortlist by company size,
2. a comparison table focused on MRP speed and multi-plant support, or
3. recommendations based on your industry and number of plants.