Microsoft recommends the following (quoting from the website):
Decreasing the total number of records that can be selected in a list. If the number of items displayed in a list is reduced to 50, the user would need to perform this operation 120 times within 300 seconds. The user would have to complete the operation on each list within 2.5 seconds.
Combine the selected operations into a batch. A batch can contain up to 1000 operations and will avoid the number of requests limit. However, you will need to be prepared for the execution time limit.
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