[JIRAALIGN-1950] Performance : Release Vechicle Updates take ~30 secs to complete after clicking "Save and Close"

Issue Summary

Customers have reported some performance issues when making and saving updates to their release vehicles. Some of the release vehicles have as little as 5 features and 24 stories associated with them, so, this doesn't seem to be directly related to the amount of work items themselves.

Steps to Reproduce

1. Navigate to the Release Vehicles Grid.
2. Click on a Release Vehicle and make updates to it inside the details panel. In the customer's case, they added a Contributing Program to the Release Vehicle.
3. Click Save and Close.

Expected Results

The Save and Close should only take a couple of seconds at most and the details panel should close.

Actual Results

When the customer clicked save and close it took almost 30 seconds for the save to finish to complete and close the details panel window.

The slowdown is actually occurring during a get request when the customer clicks save&close. In reviewing the HAR capture, we see that this GET request takes 27 seconds to complete. We are in addVehicles.asp when this happens.

The request start and end times as well as the response start and end times are reasonably short, but, there's a big gap of around 26 seconds between the request end time and the response start time.

Request Start Time 8/18/20 20:01:26
Request End Time 8/18/20 20:01:26
Response Start Time 8/18/20 20:01:52
Response End Time 8/18/20 20:01:53

This is what we see on backend logging for the same request:

8/18/20
8:01:53.000 PM	
2020-08-19 01:01:53 172.28.5.43 GET /addVehicles VehicleID=2863&ReleaseID=14&CloseDetails=true 443 6 172.28.168.219 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/84.0.4147.125+Safari/537.36 https://xxxxxxx.agilecraft.com/ReleaseVehicleGrid?stfilter=true&Releases=14&VehicleID=2863 200 0 0 27357

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available