We are currently supporting multiple clients who are using the Manufacturing module in their BC Online environment.Regarding performance, the critical factor is always transaction/user counts rather than the use of a particular module. As a general example, if you have 10-20 Work Centers in a single location and have 25-50 shop floor employees executing 50-100 Production Orders per day, there should be no concern in regards to performance when compared to BC On Premise. And the benefits of being in the Online environment are worth any potential issues. If you integrations where a high volume of data is being fed into BC or other somewhat unique circumstances, these would be something you would want to discuss with your Microsoft partner to make sure you have the proper deployment.Of course your question is a reasonable one and Microsoft recently published a webinar and document on exactly how BC Online scales with volume and provides some very specific metrics in terms of what it considers to be a "large" BC Online deployment where further analysis is required.
hope that helps some,
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