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If you book a batch of invoices, before to book the batch, you should get the Id of the recurring objects which are often the same for all invoices:

• BookPeriod
• Journal
• CentralAccountType for Customers or Suppliers
• GLAccounts if they are often the same, or make a cache in your application to resolve multiple time find the Id of a GLAccount.Code that you already got
• Vat for most used VAT code (0, 6, 21, ...)
• Currency
• Customer Id for the walking customer

Doing like that, you will have a quicker posting of your invoices and you will load less the infrastructure of WinBooks on Web