Modern websites are becoming more and more resource intensive, including ServiceNow as new features are incorporated to make your instance more interactive, visually pleasant, and feature rich.
Some examples of virtual environments are:
On a well-resourced machine, this freeze is brief and will take only a few seconds at most. However, if you are using IE11 and your environment does not have the appropriate resources, this freeze time can incfrease and become very visible and obstructive to users.
All ServiceNow Releases using UI16
IE11, virtual environments like Citrix, VMware etc.
Performance issues that can be attributed to lack of resources in your virtual environment will present across multiple websites, not just ServiceNow. If users are reporting performance issues in IE11 and you're running inside a virtual environment, be sure to check thoroughly whether your users are having performance issues with any other websites.
Another way to test is to use a web browser benchmarking tool such as the following:
Best practice is to run these tests in the same browser with the same operating system version both inside and outside your virtual environment. Doing so enables you to determine how much of the performance drop across tests can be attributed to the virtual environment.
Some of the various paths forward to ensure that ServiceNow will run well in your virtual environment are: