Currently you can have 25 concurrent connections to a Restlet per user login (2016.1). This is being changed to 25 per NetSuite account. Beyond your guaranteed 25, Netsuite will honor additional connections if they have the bandwidth available.
This is a huge reduction in the viability of building scalable integrations using Restlets. Previously you could purchase additional user licenses if you needed to handle more requests. It does not appear that NetSuite is providing a mechanism to purchase more bandwidth for Restlets.
Check out the NetSuite Release notes for 2016.2.
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