Hello @Andreas_Marinopoulos
Yes, when you go through the loop it will stop on each request and wait until it’s done.
And with Codeless it is not possible to run blocks in parallel, because it breaks the sequence when blocks are running one by one.
However, I can propose you create a JS API Service do it there using Promise.all([request1, request2, requestN])
500 sounds too much for one API Service, do you consider a way to create/update/delete objects using bulk operation?
Regards, Vlad