Please elaborate on the timeout occurring with large data sets. If it is related to session timeout, please check the recommended settings in the Report is unavailable or session has expired error message
The only issue that comes to my mind is that if you use a Table item to display the data, the content in Interactive preview will be rendered on a single page, and browsers have limitations about the number of HTML elements rendered on a single page - Browsers and Limitations
. This can be avoided by using Print preview, or adding ToggleVisibilityAction and displaying initially a smaller number of rows which expanded show the rest content in bits, not the whole content at once.
There are also other workarounds like avoiding the Table item or filtering data
to smaller sets.
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