Please try out the following steps to debug customer setups where slowness or GUI hung issues are reported: 

On Versa Director Shell

Check spring-boot process API endpoint

curl -k -v -u Administrator:Versa@123 -X GET -H "Accept: application/json" -H "Content-Type: application/json " http://127.0.0.1:8090/nextgen/track/users/usersettings

Check NCS API endpoint

curl -v -k -u Administrator:Versa@1234 -X GET https://10.192.220.193:9182/api/config/nms/provider/appliances/appliance -H "Accept: application/vnd.yang.data+json" -H "Content-Type: application/vnd.yang.data+json"

Check vnms API endpoint

curl -v -k -u Administrator:Versa@1234 -X GET "https://10.192.220.193:9182/vnms/appliance/appliance?offset=0&limit=25" -H "Accept: application/json" -H "Content-Type: application/json"

On Versa Director CLI Config Mode

Try some commit operation from NCS cli:

Administrator@s2-vd-2% set system contact test

[ok][2018-08-27 07:44:20]

[edit]

Administrator@s2-vd-2% commit

Commit complete.

[ok][2018-08-27 07:44:21]

Check NCS status for stuck/waiting operations

ncs --status | grep -i "waiting"