Hi Wang,
Of course, its possible but not from the base implementation. You have to implement the custom javascript (Legacy Implementation) or DTM (Dynamic Tag Management) to get this additional data. Please look at the below link where you can get the detail description, process and steps.
https://blogs.adobe.com/digitalmarketing/analytics/measuring-site-speed-in-adobe-analytics/
Again, once you implemented those custom script the data/value should be pass to both conversation and traffic variables (if required). Then finally you can breakdown the page loading performance report based out the City.
Hope this helps!
Thanks,
Vijay