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Note that in Groovy variables should not be declared inside the loops.

The following code can result in an error message "Too many new instances created" in the server log:

for (...) {
  def var = [:]
}

So you should always change it to this form:

def var
for (...) {
  var = [:]
}

The technical background is that the first script allocates a new variable which can increase the number of FormulaSandbox instances (above the limit).