Unable to pass multiple Items in single request to fetch Item availability

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Hi All,

We have a requirement where we need to design a VBCS screen which displays all Items along with their availability and to fetch availability for an Item we are using below mentioned SOAP service 
https://XXXX-dev1.fa.us6.oraclecloud.com:443/fscmService/OnhandQuantityServiceV2?WSDL with queryAllInventory operation. But the problem with this service it accepts only one item at a time so when we have 1000 items to display we are forced to invoke the same service 1000 time and each invoke is taking around 0.3 seconds which is 
summing upto 0.3*1000=300seconds(5min) which is causing severe performance issue in VBCS screen.