Problem with the report (list) after importing a large amount of data

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I have a problem with a report (simple display of a table with objects) for a process into which about 150,000 objects have been imported using the API.
After opening the report, a long loading bar appears and then the message "Failed with unknown exception" and to check the calculated columns. There are no calculated columns in the report. There are no such problems for the previous case of 20,000 loaded objects.

What could be the reason? Is there any optimization of the WEBCON platform after such a large import?
Or maybe you need database optimization? Repair (reorganization) of indexes or database file operations? What do you recommend?