is the report customized?

Please check on how you have joined the tables from table schema, if correctly done.

hello @vannakheng66 ,
In addition to what @michaelndungi64 has mentioned, if your database has large set of data that are to be display in the report, it would take time to load & display them. So if you have any parameters to be used to filter the records in the report kindly try them. Also, if there are multiple subreports in a single report, then also the report takes time to load.

@vannakheng66 If all the above recommendations don’t help or provide additional information, upload the report and we can take a look