If you set the writing process of file type adapter (except Excel adapter) such as writing process of CSV adapter during repetition processing, Performance is degraded because the open and close of the writing target file are performed in repeat processing units.
If you use the CSV file writing process in the repeated (number of data) process, please refer to the following help for how to reduce the frequency of file open.
URL:https://www.hulft.com/help/en-us/DataSpider/dss42sp2/help/en/adapter/basic/foreach.html