Ineffective static files served through Tomcat

Summary

Static files served via Tomcat are inefficient. As a result, users experience a delay in loading pages that retrieve these files. 

Environment

Jira Server regardless private or public facing

Steps to Reproduce

1. In Chrome, run the Developer Tools and select the Network tab
2. Access Jira via an invalid link. For example: <baseURL>/random
3. Monitor the time taken to load the 404 page

Expected Results

Error 404 Page Not Found should be returned immediately

Actual Results

It takes about 20s+ to load the page and most of it are spent on retrieving /static-assets/metal-all.css and /static-assets/metal-all.js

Notes

This behaviour does not affect Jira integrated with Nginx