Use the below links to find out which scripts/resources are taking longer time to load:
Notes: These are performance tests for your webpage.
Under Google Page Speed Insights, if you take the request URL and run it, you would be able to identify which resources are taking longer time to load. Attached Screenshot is a reference to identify: (This uses lighthouse to do the testing, you can also request an API key to perform the same task on the total website)
This provides insights on what resources are making your webpage take time to load. Attached Screenshot gives an example of my website:
If you could share your URL or run the above tests, you can easily know which resources are taking time to load, do the fixes accordingly to solve your problem.